tint: Fix MSL generation of '&' and '|' with booleans

The bitwise-and and bitwise-or binary operators on booleans result in an integer.
Explicitly cast this back to a boolean.

Fixed: tint:1540
Fixed: tint:1541
Change-Id: I395176f291e6080c88b8cff18e14ed6cd1234074
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/90501
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl

@@ -0,0 +1,6 @@
+@stage(compute) @workgroup_size(1)
+fn f() {
+    let a = true;
+    let b = false;
+    let r : bool = a & b;
+}

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl.expected.glsl

@@ -0,0 +1,11 @@
+#version 310 es
+
+void f() {
+  bool r = bool(uint(true) & uint(false));
+}
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main() {
+  f();
+  return;
+}

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl.expected.hlsl

@@ -0,0 +1,5 @@
+[numthreads(1, 1, 1)]
+void f() {
+  const bool r = (true & false);
+  return;
+}

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl.expected.msl

@@ -0,0 +1,10 @@
+#include <metal_stdlib>
+
+using namespace metal;
+kernel void f() {
+  bool const a = true;
+  bool const b = false;
+  bool const r = bool(a & b);
+  return;
+}
+

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl.expected.spvasm

@@ -0,0 +1,20 @@
+; SPIR-V
+; Version: 1.3
+; Generator: Google Tint Compiler; 0
+; Bound: 9
+; Schema: 0
+               OpCapability Shader
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint GLCompute %f "f"
+               OpExecutionMode %f LocalSize 1 1 1
+               OpName %f "f"
+       %void = OpTypeVoid
+          %1 = OpTypeFunction %void
+       %bool = OpTypeBool
+       %true = OpConstantTrue %bool
+      %false = OpConstantFalse %bool
+          %f = OpFunction %void None %1
+          %4 = OpLabel
+          %8 = OpLogicalAnd %bool %true %false
+               OpReturn
+               OpFunctionEnd

test/tint/expressions/binary/bit-and/scalar-scalar/bool.wgsl.expected.wgsl

@@ -0,0 +1,6 @@
+@stage(compute) @workgroup_size(1)
+fn f() {
+  let a = true;
+  let b = false;
+  let r : bool = (a & b);
+}