A64: Use a scope utility to allocate scratch registers.

src/a64/full-codegen-a64.cc

Index: src/a64/full-codegen-a64.cc
diff --git a/src/a64/full-codegen-a64.cc b/src/a64/full-codegen-a64.cc
index 4414cb391cf770df81f5ce78eda48e44a1c5d220..776053094ca68ffc553be7bc2aa8840ba5bae300 100644
--- a/src/a64/full-codegen-a64.cc
+++ b/src/a64/full-codegen-a64.cc
@@ -86,10 +86,10 @@ class JumpPatchSite BASE_EMBEDDED {
   }
 
   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() {