A64: Use a scope utility to allocate scratch registers.

src/a64/full-codegen-a64.cc

 // 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 68 matching lines @@
     InstructionAccurateScope scope(masm_, 1);
     ASSERT(!info_emitted_);
     ASSERT(reg.Is64Bits());
     ASSERT(!reg.Is(csp));
     reg_ = reg;
     __ bind(&patch_site_);
     __ tbnz(xzr, 0, target);  // Never taken before patched.
   }
 
   void EmitJumpIfEitherNotSmi(Register reg1, Register reg2, Label* target) {
-    // We need to use ip0, so don't allow access to the MacroAssembler.
-    InstructionAccurateScope scope(masm_);
-    __ orr(ip0, reg1, reg2);
-    EmitJumpIfNotSmi(ip0, target);
+    UseScratchRegisterScope temps(masm_);
+    Register temp = temps.AcquireX();
+    __ Orr(temp, reg1, reg2);
+    EmitJumpIfNotSmi(temp, target);
   }
 
   void EmitPatchInfo() {
     Assembler::BlockPoolsScope scope(masm_);
     InlineSmiCheckInfo::Emit(masm_, reg_, &patch_site_);
 #ifdef DEBUG
     info_emitted_ = true;
 #endif
   }
 
@@ skipping 4867 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64