[wasm] Remove V8.LiftoffCompileMicroSeconds counter

The counter gets created but isn't used anywhere.

R=clemensb@chromium.org

Bug: v8:10933
Change-Id: I480e601f8118475a3ce750ba97fdae6780342d49
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2497166Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70756}

src/logging/counters-definitions.h

@@ -184,8 +184,6 @@ namespace internal {
      1000000, MICROSECOND)                                                     \
   HT(wasm_compile_wasm_function_time, V8.WasmCompileFunctionMicroSeconds.wasm, \
      1000000, MICROSECOND)                                                     \
-  HT(liftoff_compile_time, V8.LiftoffCompileMicroSeconds, 10000000,            \
-     MICROSECOND)                                                              \
   HT(wasm_instantiate_wasm_module_time,                                        \
      V8.WasmInstantiateModuleMicroSeconds.wasm, 10000000, MICROSECOND)         \
   HT(wasm_instantiate_asm_module_time,                                         \

src/wasm/baseline/liftoff-compiler.cc

@@ -4120,10 +4120,6 @@ WasmCompilationResult ExecuteLiftoffCompilation(
 
   Zone zone(allocator, "LiftoffCompilationZone");
   auto call_descriptor = compiler::GetWasmCallDescriptor(&zone, func_body.sig);
-  base::Optional<TimedHistogramScope> liftoff_compile_time_scope;
-  if (counters) {
-    liftoff_compile_time_scope.emplace(counters->liftoff_compile_time());
-  }
   size_t code_size_estimate =
       WasmCodeManager::EstimateLiftoffCodeSize(func_body_size);
   // Allocate the initial buffer a bit bigger to avoid reallocation during code
@@ -4142,7 +4138,6 @@ WasmCompilationResult ExecuteLiftoffCompilation(
       debug_sidetable_builder.get(), for_debugging, func_index, breakpoints,
       dead_breakpoint);
   decoder.Decode();
-  liftoff_compile_time_scope.reset();
   LiftoffCompiler* compiler = &decoder.interface();
   if (decoder.failed()) {
     compiler->OnFirstError(&decoder);