tint/test-runner: Split expectations for FXC and DXC

Change tint's `--fxc` flag to take the path of the FXC compiler DLL.
Have tint attempt to validate with both FXC and DXC if `--validate` is
passed.

Fix the 'dirsWithNoPassExpectations' logic which looks like it got
broken with the tint -> dawn merge. It also incorrectly applied
filepath.FromSlash() on windows.

Change-Id: I0f46aa5c21bc48a2abc48402c41f846aff4a8633
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/96800
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>

test/tint/builtins/gen/var/arrayLength/1588cd.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+ByteAddressBuffer sb_ro : register(t1, space0);
+
+void arrayLength_1588cd() {
+  uint tint_symbol_2 = 0u;
+  sb_ro.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_1588cd();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_1588cd();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_1588cd();
+  return;
+}

test/tint/builtins/gen/var/arrayLength/61b1c7.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+RWByteAddressBuffer sb_rw : register(u0, space0);
+
+void arrayLength_61b1c7() {
+  uint tint_symbol_2 = 0u;
+  sb_rw.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_61b1c7();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_61b1c7();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_61b1c7();
+  return;
+}

test/tint/builtins/gen/var/arrayLength/a0f5ca.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+ByteAddressBuffer sb_ro : register(t1, space0);
+
+void arrayLength_a0f5ca() {
+  uint tint_symbol_2 = 0u;
+  sb_ro.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_a0f5ca();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_a0f5ca();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_a0f5ca();
+  return;
+}

test/tint/builtins/gen/var/arrayLength/cbd6b5.wgsl.expected.dxc.hlsl

@@ -0,0 +1 @@
+SKIP

test/tint/builtins/gen/var/arrayLength/cbd6b5.wgsl.expected.fxc.hlsl

@@ -0,0 +1 @@
+SKIP

test/tint/builtins/gen/var/arrayLength/cdd123.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+RWByteAddressBuffer sb_rw : register(u0, space0);
+
+void arrayLength_cdd123() {
+  uint tint_symbol_2 = 0u;
+  sb_rw.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_cdd123();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_cdd123();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_cdd123();
+  return;
+}

test/tint/builtins/gen/var/arrayLength/cfca0a.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+ByteAddressBuffer sb_ro : register(t1, space0);
+
+void arrayLength_cfca0a() {
+  uint tint_symbol_2 = 0u;
+  sb_ro.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_cfca0a();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_cfca0a();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_cfca0a();
+  return;
+}

test/tint/builtins/gen/var/arrayLength/eb510f.wgsl.expected.fxc.hlsl

@@ -0,0 +1,35 @@
+RWByteAddressBuffer sb_rw : register(u0, space0);
+
+void arrayLength_eb510f() {
+  uint tint_symbol_2 = 0u;
+  sb_rw.GetDimensions(tint_symbol_2);
+  const uint tint_symbol_3 = ((tint_symbol_2 - 0u) / 4u);
+  uint res = tint_symbol_3;
+}
+
+struct tint_symbol {
+  float4 value : SV_Position;
+};
+
+float4 vertex_main_inner() {
+  arrayLength_eb510f();
+  return (0.0f).xxxx;
+}
+
+tint_symbol vertex_main() {
+  const float4 inner_result = vertex_main_inner();
+  tint_symbol wrapper_result = (tint_symbol)0;
+  wrapper_result.value = inner_result;
+  return wrapper_result;
+}
+
+void fragment_main() {
+  arrayLength_eb510f();
+  return;
+}
+
+[numthreads(1, 1, 1)]
+void compute_main() {
+  arrayLength_eb510f();
+  return;
+}