Fix ast_clone_fuzzer tests

Demangle the printed AST before comparing.

Many to_str() methods on AST nodes will print the symbol numerical identifiers, which is not guaranteed to be stable between clones.
By comparing the demangled AST, these should be stable.

Fixed: chromium:1160099
Change-Id: I4e62adbccc690a1531f78dc70cef8480ed6f3f2c
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/36621
Commit-Queue: Ben Clayton <bclayton@google.com>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Auto-Submit: Ben Clayton <bclayton@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>

fuzzers/tint_ast_clone_fuzzer.cc

@@ -16,6 +16,7 @@
 #include <string>
 #include <unordered_set>
 
+#include "src/demangler.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/writer/wgsl/generator.h"
 
@@ -57,8 +58,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   // Clone the src module to dst
   auto dst = src.Clone();
 
-  // Expect the AST printed with to_str() to match
-  ASSERT_EQ(src.to_str(), dst.to_str());
+  // Expect the demangled AST printed with to_str() to match
+  tint::Demangler d;
+  ASSERT_EQ(d.Demangle(src, src.to_str()), d.Demangle(dst, dst.to_str()));
 
   // Check that none of the AST nodes or type pointers in dst are found in src
   std::unordered_set<tint::ast::Node*> src_nodes;