[Sheriff] Revert "MIPS: Ensure double aligned allocations through runtime routines."

This reverts commit r17809 for breaking the build.

TBR=plind44@gmail.com,
BUG=

Review URL: https://codereview.chromium.org/74803002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17810 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -9786,7 +9786,6 @@ static MaybeObject* Allocate(Isolate* isolate,
                              bool double_align,
                              AllocationSpace space) {
   Heap* heap = isolate->heap();
-  if (double_align) size += kPointerSize;
   RUNTIME_ASSERT(IsAligned(size, kPointerSize));
   RUNTIME_ASSERT(size > 0);
   RUNTIME_ASSERT(size <= heap->MaxRegularSpaceAllocationSize());
@@ -9798,9 +9797,6 @@ static MaybeObject* Allocate(Isolate* isolate,
   MemoryChunk* chunk = MemoryChunk::FromAddress(allocation->address());
   ASSERT(chunk->owner()->identity() == space);
 #endif
-  if (double_align) {
-    allocation = heap->EnsureDoubleAligned(allocation, size);
-  }
   heap->CreateFillerObjectAt(allocation->address(), size);
   return allocation;
 }