Revert of [wasm] Identify wasm functions with index into the function tables....

Revert of [wasm] Identify wasm functions with index into the function tables. (patchset #7 id:110001 of https://codereview.chromium.org/2690113012/ )

Reason for revert:
Introduces a new test failure/flake: https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug/builds/13707

Original issue's description:
> [wasm] Identify wasm functions with index into the function tables.
>
> Currently, the default name for wasm functions in generated code is 'wasm', tag wasm functions with the index into the function table to identify functions. Snippets of sample output with --print-code below.
>
> Before:
> --- Code ---
> kind = WASM_FUNCTION
> name = wasm
> compiler = turbofan
>
> After:
> --- Code ---
> kind = WASM_FUNCTION
> name = wasm#200
> compiler = turbofan
>
> R=mtrofin@chromium.org
>
> Review-Url: https://codereview.chromium.org/2690113012
> Cr-Commit-Position: refs/heads/master@{#43296}
> Committed: https://chromium.googlesource.com/v8/v8/+/5fc3ac29e4d942ccb4c45f6cdcee75d0b394b296

TBR=mtrofin@chromium.org,gdeepti@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/2708593002
Cr-Commit-Position: refs/heads/master@{#43302}

src/compiler/wasm-compiler.cc

@@ -4011,13 +4011,6 @@ SourcePositionTable* WasmCompilationUnit::BuildGraphForWasmFunction(
   return source_position_table;
 }
 
-char* WasmCompilationUnit::GetTaggedFunctionName(
-    const wasm::WasmFunction* function) {
-  snprintf(function_name_, sizeof(function_name_), "wasm#%d",
-           function->func_index);
-  return function_name_;
-}
-
 WasmCompilationUnit::WasmCompilationUnit(wasm::ErrorThrower* thrower,
                                          Isolate* isolate,
                                          wasm::ModuleBytesEnv* module_env,
@@ -4038,7 +4031,7 @@ WasmCompilationUnit::WasmCompilationUnit(wasm::ErrorThrower* thrower,
       compilation_zone_(isolate->allocator(), ZONE_NAME),
       info_(function->name_length != 0
                 ? module_env->wire_bytes.GetNameOrNull(function)
-                : CStrVector(GetTaggedFunctionName(function)),
+                : ArrayVector("wasm"),
             isolate, &compilation_zone_,
             Code::ComputeFlags(Code::WASM_FUNCTION)),
       job_(),

src/compiler/wasm-compiler.h

@@ -68,14 +68,11 @@ class WasmCompilationUnit final {
 
  private:
   SourcePositionTable* BuildGraphForWasmFunction(double* decode_ms);
-  char* GetTaggedFunctionName(const wasm::WasmFunction* function);
 
   wasm::ErrorThrower* thrower_;
   Isolate* isolate_;
   wasm::ModuleBytesEnv* module_env_;
   const wasm::WasmFunction* function_;
-  // Function name is tagged with uint32 func_index - wasm#<func_index>
-  char function_name_[16];
   // The graph zone is deallocated at the end of ExecuteCompilation.
   std::unique_ptr<Zone> graph_zone_;
   JSGraph* jsgraph_;