Fix build and test failures from packed array optimizations.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10332317

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11638 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/macro-assembler-x64.cc

@@ -4059,7 +4059,7 @@ void MacroAssembler::LoadTransitionedArrayMapConditional(
   movq(scratch, Operand(scratch,
                         Context::SlotOffset(Context::JS_ARRAY_MAPS_INDEX)));
 
-  size_t offset = expected_kind * kPointerSize +
+  int offset = expected_kind * kPointerSize +
       FixedArrayBase::kHeaderSize;
   cmpq(map_in_out, FieldOperand(scratch, offset));
   j(not_equal, no_map_match);

test/mjsunit/unbox-double-arrays.js

@@ -278,7 +278,8 @@ function testOneArrayType(allocator) {
                       expected_array_value(7));
 
   %DeoptimizeFunction(test_various_loads6);
-  gc();
+  %ClearFunctionTypeFeedback(test_various_stores);
+  %ClearFunctionTypeFeedback(test_various_loads7);
 
   // Test stores for non-NaN.
   var large_array = new allocator(large_array_size);