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

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index be9938b4a1b5eb9ef06f597728a39a0f53dc5fbf..b844cb579433bc5788e6dc051e3156e4168ba703 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -1944,7 +1944,7 @@ int MarkCompactCollector::DiscoverAndEvacuateBlackObjectsOnPage(
       AllocationResult allocation;
 #ifndef V8_HOST_ARCH_64_BIT
       if (object->NeedsToEnsureDoubleAlignment()) {
-        allocation = new_space->AllocateRawDoubleAligned(size);
+        allocation = new_space->AllocateRawAligned(size, kDoubleAligned);
       } else {
         allocation = new_space->AllocateRaw(size);
       }
@@ -1960,7 +1960,7 @@ int MarkCompactCollector::DiscoverAndEvacuateBlackObjectsOnPage(
         }
 #ifndef V8_HOST_ARCH_64_BIT
         if (object->NeedsToEnsureDoubleAlignment()) {
-          allocation = new_space->AllocateRawDoubleAligned(size);
+          allocation = new_space->AllocateRawAligned(size, kDoubleAligned);
         } else {
           allocation = new_space->AllocateRaw(size);
         }
@@ -3122,7 +3122,7 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
   AllocationResult allocation;
 #ifndef V8_HOST_ARCH_64_BIT
   if (object->NeedsToEnsureDoubleAlignment()) {
-    allocation = old_space->AllocateRawDoubleAligned(object_size);
+    allocation = old_space->AllocateRawAligned(object_size, kDoubleAligned);
   } else {
     allocation = old_space->AllocateRaw(object_size);
   }