MIPS: Fix context loading in CheckAccessGlobalProxy

src/mips64/macro-assembler-mips64.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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
@@ skipping 494 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // Allocation support.
 
 
 void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
                                             Register scratch,
                                             Label* miss) {
   Label same_contexts;
+  Register temporary = t8;
 
   DCHECK(!holder_reg.is(scratch));
   DCHECK(!holder_reg.is(at));
   DCHECK(!scratch.is(at));
 
   // Load current lexical context from the active StandardFrame, which
   // may require crawling past STUB frames.
   Label load_context;
   Label has_context;
   mov(at, fp);
   bind(&load_context);
   ld(scratch, MemOperand(at, CommonFrameConstants::kContextOrFrameTypeOffset));
-  JumpIfNotSmi(scratch, &has_context);
+  // Passing temporary register, otherwise JumpIfNotSmi modifies register at.
+  JumpIfNotSmi(scratch, &has_context, temporary);
   ld(at, MemOperand(at, CommonFrameConstants::kCallerFPOffset));
-  b(&load_context);
+  Branch(&load_context);
   bind(&has_context);
 
   // In debug mode, make sure the lexical context is set.
 #ifdef DEBUG
   Check(ne, kWeShouldNotHaveAnEmptyLexicalContext,
       scratch, Operand(zero_reg));
 #endif
 
   // Load the native context of the current context.
   ld(scratch, ContextMemOperand(scratch, Context::NATIVE_CONTEXT_INDEX));
@@ skipping 6152 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64