[Bug target/18404] unnecessary sll when -mint64 (MIPS)

[echristo at redhat dot com]

-- 
Bug 18404 depends on bug 18442, which changed state.

Bug 18442 Summary: [4.0 Regression] Rejects attribute((mode(SI))) when using -mint64
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18442

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18404