Remove unneccessary assert.

This assert fails when dumping native counters on x64.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/151033003

Patch from Weiliang Lin <weiliang.lin@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19253 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -3855,7 +3855,6 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
     Register value = ToRegister(instr->value());
     if (instr->object()->IsConstantOperand()) {
       ASSERT(value.is(rax));
-      ASSERT(!access.representation().IsSpecialization());
       LConstantOperand* object = LConstantOperand::cast(instr->object());
       __ store_rax(ToExternalReference(object));
     } else {