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during a tail call. A parameter might overwrite this stack slot during the tail call. The sequence during a tail call is: 1.) load return address to temp reg 2.) move parameters (might involve storing to return address stack slot) 3.) store return address to new location from temp reg If the stack location is marked immutable CodeGen can colocate load (1) with the store (3). This fixes bug 6225. llvm-svn: 96783
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