Added Heap:: prefix to kFixedArrayMapRootIndex in ARM

codegenerator. The missing scoping breaks the build with some
compilers.

TBR=sgjesse@chromium.org
Review URL: http://codereview.chromium.org/2036007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/codegen-arm.cc

@@ -8652,7 +8652,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   __ ldr(last_match_info_elements,
          FieldMemOperand(r0, JSArray::kElementsOffset));
   __ ldr(r0, FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
-  __ LoadRoot(ip, kFixedArrayMapRootIndex);
+  __ LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
   __ cmp(r0, ip);
   __ b(ne, &runtime);
   // Check that the last match info has space for the capture registers and the