Fix x64 compilation error. Patch from tfarina@chromium.org

http://codereview.chromium.org/3442004/show

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5466 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/code-stubs-x64.cc

@@ -1989,7 +1989,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   __ j(negative, &done);
   // Read the value from the static offsets vector buffer and make it a smi.
   __ movl(rdi, Operand(rcx, rdx, times_int_size, 0));
-  __ Integer32ToSmi(rdi, rdi, &runtime);
+  __ Integer32ToSmi(rdi, rdi);
   // Store the smi value in the last match info.
   __ movq(FieldOperand(rbx,
                        rdx,

src/x64/macro-assembler-x64.cc

-// Copyright 2009 the V8 project authors. All rights reserved.
+// Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1015,7 +1015,6 @@ void MacroAssembler::SmiSub(Register dst,
                             const Operand& src2) {
   // No overflow checking. Use only when it's known that
   // overflowing is impossible (e.g., subtracting two positive smis).
-  ASSERT(!dst.is(src2));
   if (dst.is(src1)) {
     subq(dst, src2);
   } else {