Change store buffer overflow check to not rely on the store buffer being (2*Size) aligned.

src/x87/macro-assembler-x87.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_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 178 matching lines @@
       ExternalReference::store_buffer_top(isolate());
   mov(scratch, Operand::StaticVariable(store_buffer));
   // Store pointer to buffer.
   mov(Operand(scratch, 0), addr);
   // Increment buffer top.
   add(scratch, Immediate(kPointerSize));
   // Write back new top of buffer.
   mov(Operand::StaticVariable(store_buffer), scratch);
   // Call stub on end of buffer.
   // Check for end of buffer.
-  test(scratch, Immediate(StoreBuffer::kStoreBufferOverflowBit));
+  test(scratch, Immediate(StoreBuffer::kStoreBufferMask));
   if (and_then == kReturnAtEnd) {
     Label buffer_overflowed;
-    j(not_equal, &buffer_overflowed, Label::kNear);
+    j(equal, &buffer_overflowed, Label::kNear);
     ret(0);
     bind(&buffer_overflowed);
   } else {
     DCHECK(and_then == kFallThroughAtEnd);
-    j(equal, &done, Label::kNear);
+    j(not_equal, &done, Label::kNear);
   }
   StoreBufferOverflowStub store_buffer_overflow(isolate(), save_fp);
   CallStub(&store_buffer_overflow);
   if (and_then == kReturnAtEnd) {
     ret(0);
   } else {
     DCHECK(and_then == kFallThroughAtEnd);
     bind(&done);
   }
 }
@@ skipping 3043 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87