A64: Use a scope utility to allocate scratch registers.

src/a64/assembler-a64-inl.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 161 matching lines @@
 inline void CPURegList::Combine(const CPURegList& other) {
   ASSERT(IsValid());
   ASSERT(other.type() == type_);
   ASSERT(other.RegisterSizeInBits() == size_);
   list_ |= other.list();
 }
 
 
 inline void CPURegList::Remove(const CPURegList& other) {
   ASSERT(IsValid());
-  ASSERT(other.type() == type_);
-  ASSERT(other.RegisterSizeInBits() == size_);
-  list_ &= ~other.list();
+  if (other.type() == type_) {
+    list_ &= ~other.list();
+  }
 }
 
 
 inline void CPURegList::Combine(const CPURegister& other) {
   ASSERT(other.type() == type_);
   ASSERT(other.SizeInBits() == size_);
   Combine(other.code());
 }
 
 
-inline void CPURegList::Remove(const CPURegister& other) {
-  ASSERT(other.type() == type_);
-  ASSERT(other.SizeInBits() == size_);
-  Remove(other.code());
+inline void CPURegList::Remove(const CPURegister& other1,
+                               const CPURegister& other2,
+                               const CPURegister& other3,
+                               const CPURegister& other4) {
+  if (!other1.IsNone() && (other1.type() == type_)) Remove(other1.code());
+  if (!other2.IsNone() && (other2.type() == type_)) Remove(other2.code());
+  if (!other3.IsNone() && (other3.type() == type_)) Remove(other3.code());
+  if (!other4.IsNone() && (other4.type() == type_)) Remove(other4.code());
 }
 
 
 inline void CPURegList::Combine(int code) {
   ASSERT(IsValid());
   ASSERT(CPURegister::Create(code, size_, type_).IsValid());
   list_ |= (1UL << code);
 }
 
 
@@ skipping 982 matching lines @@
 
 
 void Assembler::ClearRecordedAstId() {
   recorded_ast_id_ = TypeFeedbackId::None();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_ASSEMBLER_A64_INL_H_