Support double allocations when folding allocation.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index d12b229c381323ca0f80f417548b6e29e90e9403..dd3711576f1ef12d7f3a170dcb73cab9f84d0ca2 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4166,6 +4166,16 @@ void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
 void LCodeGen::DoInnerAllocatedObject(LInnerAllocatedObject* instr) {
   Register result = ToRegister(instr->result());
   Register base = ToRegister(instr->base_object());
+  int offset = instr->offset();
+  if (instr->hydrogen()->MustAllocateDoubleAligned()) {
+    ASSERT(kPointerAlignment * 2 == kDoubleAlignment);
+    Label aligned;
+    Register scratch = scratch0();
+    __ and_(scratch, result, Operand(kDoubleAlignmentMask), SetCC);
+    __ b(eq, &aligned);
+    offset += kDoubleSize / 2;
+    __ bind(&aligned);
+  }
   __ add(result, base, Operand(instr->offset()));
 }