Add the same optimization that we do loading from fixed alloca slots to storing to fixed alloca slots.
Add the same optimization that we do loading from fixed alloca slots to
storing to fixed alloca slots.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@18221 91177308-0d34-0410-b5e6-96231b3b80d8

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