[turbofan] Run everything after representation selection concurrently.

src/x64/interface-descriptors-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 224 matching lines @@
 }
 
 #define SIMD128_ALLOC_DESC(TYPE, Type, type, lane_count, lane_type) \
   void Allocate##Type##Descriptor::InitializePlatformSpecific(      \
       CallInterfaceDescriptorData* data) {                          \
     data->InitializePlatformSpecific(0, nullptr, nullptr);          \
   }
 SIMD128_TYPES(SIMD128_ALLOC_DESC)
 #undef SIMD128_ALLOC_DESC
 
-void AllocateDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {rax};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
 void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state
   // rax -- number of arguments
   // rdi -- function
   // rbx -- allocation site with elements kind
   Register registers[] = {rdi, rbx};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
@@ skipping 158 matching lines @@
       rbx,  // the JSGeneratorObject to resume
       rdx   // the resume mode (tagged)
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64