[HEAP] Remove SIMD 128 bit alignment from heap.

src/globals.h

 // 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 352 matching lines @@
 const intptr_t kObjectAlignmentMask = kObjectAlignment - 1;
 
 // Desired alignment for pointers.
 const intptr_t kPointerAlignment = (1 << kPointerSizeLog2);
 const intptr_t kPointerAlignmentMask = kPointerAlignment - 1;
 
 // Desired alignment for double values.
 const intptr_t kDoubleAlignment = 8;
 const intptr_t kDoubleAlignmentMask = kDoubleAlignment - 1;
 
-// Desired alignment for 128 bit SIMD values.
-const intptr_t kSimd128Alignment = 16;
-const intptr_t kSimd128AlignmentMask = kSimd128Alignment - 1;
-
 // Desired alignment for generated code is 32 bytes (to improve cache line
 // utilization).
 const int kCodeAlignmentBits = 5;
 const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
 const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
 
 // The owner field of a page is tagged with the page header tag. We need that
 // to find out if a slot is part of a large object. If we mask out the lower
 // 0xfffff bits (1M pages), go to the owner offset, and see that this field
 // is tagged with the page header tag, we can just look up the owner.
@@ skipping 122 matching lines @@
   LO_SPACE,    // Promoted large objects.
 
   FIRST_SPACE = NEW_SPACE,
   LAST_SPACE = LO_SPACE,
   FIRST_PAGED_SPACE = OLD_SPACE,
   LAST_PAGED_SPACE = MAP_SPACE
 };
 const int kSpaceTagSize = 3;
 const int kSpaceTagMask = (1 << kSpaceTagSize) - 1;
 
-enum AllocationAlignment {
-  kWordAligned,
-  kDoubleAligned,
-  kDoubleUnaligned,
-  kSimd128Unaligned
-};
+enum AllocationAlignment { kWordAligned, kDoubleAligned, kDoubleUnaligned };
 
 // Possible outcomes for decisions.
 enum class Decision : uint8_t { kUnknown, kTrue, kFalse };
 
 inline size_t hash_value(Decision decision) {
   return static_cast<uint8_t>(decision);
 }
 
 inline std::ostream& operator<<(std::ostream& os, Decision decision) {
   switch (decision) {
@@ skipping 818 matching lines @@
 }  // namespace internal
 }  // namespace v8
 
 // Used by js-builtin-reducer to identify whether ReduceArrayIterator() is
 // reducing a JSArray method, or a JSTypedArray method.
 enum class ArrayIteratorKind { kArray, kTypedArray };
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_