Fix typo that breaks compilation on x64.

Review URL: http://codereview.chromium.org/6342003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6336 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -277,7 +277,7 @@ bool LCodeGen::GeneratePrologue() {
       for (int offset = slots * kPointerSize - kPageSize;
            offset > 0;
            offset -= kPageSize) {
-        __ moveq(Operand(rsp, offset), rax);
+        __ movq(Operand(rsp, offset), rax);
       }
 #endif
     }