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

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index cc264f6aef251d4680e4bb4b1621353a74f18483..22179b74f31ce7d3d5a8dcfa81be3b3242c1ca77 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2822,6 +2822,15 @@ bool HeapObject::NeedsToEnsureDoubleAlignment() {
 }
 
 
+bool HeapObject::NeedsToEnsureDoubleUnalignment() {
+#ifndef V8_HOST_ARCH_64_BIT

[Benedikt Meurer, 2015/05/12 09:08:39]

I'd prefer #ifdef V8_HOST_ARCH_32_BIT here.

[Hannes Payer (out of office), 2015/05/12 11:14:55]

Done.

+  return IsHeapNumber();
+#else
+  return false;
+#endif  // V8_HOST_ARCH_64_BIT
+}
+
+
 void FixedArray::set(int index,
                      Object* value,
                      WriteBarrierMode mode) {