Implement unaligned allocate and allocate heap numbers in runtime double unaligned.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 494d05c9c792e144fcce1849533fca4a27138826..f165663af6cbd442427bb1f6e3b2948118b7386a 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -1768,8 +1768,8 @@ class PagedSpace : public Space {
 
   // Allocate the requested number of bytes in the space double aligned if
   // possible, return a failure object if not.
-  MUST_USE_RESULT inline AllocationResult AllocateRawDoubleAligned(
-      int size_in_bytes);
+  MUST_USE_RESULT inline AllocationResult AllocateRawAligned(
+      int size_in_bytes, AllocationAlignment alignment);
 
   // Give a block of memory to the space's free list.  It might be added to
   // the free list or accounted as waste.
@@ -1933,7 +1933,8 @@ class PagedSpace : public Space {
 
   // Generic fast case allocation function that tries double aligned linear
   // allocation at the address denoted by top in allocation_info_.
-  inline HeapObject* AllocateLinearlyDoubleAlign(int size_in_bytes);
+  inline HeapObject* AllocateLinearlyAligned(int size_in_bytes,
+                                             AllocationAlignment alignment);
 
   // If sweeping is still in progress try to sweep unswept pages. If that is
   // not successful, wait for the sweeper threads and re-try free-list
@@ -2500,8 +2501,8 @@ class NewSpace : public Space {
     return allocation_info_.limit_address();
   }
 
-  MUST_USE_RESULT INLINE(
-      AllocationResult AllocateRawDoubleAligned(int size_in_bytes));
+  MUST_USE_RESULT INLINE(AllocationResult AllocateRawAligned(
+      int size_in_bytes, AllocationAlignment alignment));
 
   MUST_USE_RESULT INLINE(AllocationResult AllocateRaw(int size_in_bytes));
 
@@ -2621,7 +2622,7 @@ class NewSpace : public Space {
   HistogramInfo* promoted_histogram_;
 
   MUST_USE_RESULT AllocationResult
-  SlowAllocateRaw(int size_in_bytes, bool double_aligned);
+  SlowAllocateRaw(int size_in_bytes, AllocationAlignment alignment);
 
   friend class SemiSpaceIterator;