[wasm] Remove obsolete specialization zone.

R=clemensh@chromium.org

Change-Id: Iac827a4fc82f9b810af9d67c4aa5757925edc3c5
Reviewed-on: https://chromium-review.googlesource.com/997742Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52399}

src/wasm/module-compiler.cc

@@ -15,6 +15,7 @@
 #include "src/code-stubs.h"
 #include "src/compiler/wasm-compiler.h"
 #include "src/counters.h"
+#include "src/identity-map.h"
 #include "src/property-descriptor.h"
 #include "src/trap-handler/trap-handler.h"
 #include "src/wasm/compilation-manager.h"
@@ -578,8 +579,7 @@ const wasm::WasmCode* LazyCompilationOrchestrator::CompileFunction(
   CHECK(!thrower.error());
 
   // Now specialize the generated code for this instance.
-  Zone specialization_zone(isolate->allocator(), ZONE_NAME);
-  CodeSpecialization code_specialization(isolate, &specialization_zone);
+  CodeSpecialization code_specialization;
   code_specialization.RelocateDirectCalls(compiled_module->GetNativeModule());
   code_specialization.ApplyToWasmCode(wasm_code, SKIP_ICACHE_FLUSH);
   int64_t func_size =
@@ -1641,8 +1641,7 @@ MaybeHandle<WasmInstanceObject> InstanceBuilder::Build() {
   //--------------------------------------------------------------------------
   // Create the WebAssembly.Instance object.
   //--------------------------------------------------------------------------
-  Zone instantiation_zone(isolate_->allocator(), ZONE_NAME);
-  CodeSpecialization code_specialization(isolate_, &instantiation_zone);
+  CodeSpecialization code_specialization;
   Handle<WasmInstanceObject> instance =
       WasmInstanceObject::New(isolate_, compiled_module_);
 

src/wasm/wasm-code-specialization.cc

@@ -59,7 +59,7 @@ class PatchDirectCallsHelper {
 
 }  // namespace
 
-CodeSpecialization::CodeSpecialization(Isolate* isolate, Zone* zone) {}
+CodeSpecialization::CodeSpecialization() {}
 
 CodeSpecialization::~CodeSpecialization() {}
 

src/wasm/wasm-code-specialization.h

@@ -6,7 +6,6 @@
 #define V8_WASM_WASM_CODE_SPECIALIZATION_H_
 
 #include "src/assembler.h"
-#include "src/identity-map.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-objects.h"
 
@@ -25,7 +24,7 @@ uint32_t ExtractDirectCallIndex(wasm::Decoder& decoder, const byte* pc);
 // Patch* methods, then apply all changes in one step using the Apply* methods.
 class CodeSpecialization {
  public:
-  CodeSpecialization(Isolate*, Zone*);
+  CodeSpecialization();
   ~CodeSpecialization();
 
   // Update WasmContext references.

src/wasm/wasm-objects.cc

@@ -1346,8 +1346,7 @@ void WasmCompiledModule::Reset(Isolate* isolate,
 
   // Patch code to update memory references, global references, and function
   // table references.
-  Zone specialization_zone(isolate->allocator(), ZONE_NAME);
-  wasm::CodeSpecialization code_specialization(isolate, &specialization_zone);
+  wasm::CodeSpecialization code_specialization;
 
   if (compiled_module->has_lazy_compile_data()) {
     for (int i = 0, e = compiled_module->lazy_compile_data()->length(); i < e;

test/cctest/wasm/wasm-run-utils.h

@@ -204,8 +204,7 @@ class TestingModuleBuilder {
   Address globals_start() { return reinterpret_cast<Address>(globals_data_); }
   void Link() {
     if (!linked_) {
-      Zone specialization_zone(isolate()->allocator(), ZONE_NAME);
-      CodeSpecialization code_specialization(isolate(), &specialization_zone);
+      CodeSpecialization code_specialization;
       code_specialization.RelocateDirectCalls(native_module_);
       code_specialization.ApplyToWholeModule(native_module_);
       linked_ = true;