Add SIMD 128 alignment support to Heap.

src/heap/heap.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 "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 1977 matching lines @@
 #endif
 
 
 int Heap::GetMaximumFillToAlign(AllocationAlignment alignment) {
   switch (alignment) {
     case kWordAligned:
       return 0;
     case kDoubleAligned:
     case kDoubleUnaligned:
       return kDoubleSize - kPointerSize;
+    case kSimd128Unaligned:
+      return kSimd128Size - kPointerSize;
     default:
       UNREACHABLE();
   }
   return 0;
 }
 
 
 int Heap::GetFillToAlign(Address address, AllocationAlignment alignment) {
   intptr_t offset = OffsetFrom(address);
   if (alignment == kDoubleAligned && (offset & kDoubleAlignmentMask) != 0)
     return kPointerSize;
   if (alignment == kDoubleUnaligned && (offset & kDoubleAlignmentMask) == 0)
     return kDoubleSize - kPointerSize;  // No fill if double is always aligned.
+  if (alignment == kSimd128Unaligned) {
+    return (kSimd128Size - (static_cast<int>(offset) + kPointerSize)) &
+           kSimd128AlignmentMask;
+  }
   return 0;
 }
 
 
 HeapObject* Heap::PrecedeWithFiller(HeapObject* object, int filler_size) {
   CreateFillerObjectAt(object->address(), filler_size);
   return HeapObject::FromAddress(object->address() + filler_size);
 }
 
 
@@ skipping 4645 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8