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b2eb997a2c
Before rewriting uses of one value in A to register B, check that there are no tied uses. That would require multiple A values to be rewritten. This bug can't bite in the current version of the code for a fairly subtle reason: A tied use would have caused 2-addr to insert a copy before the use. If the copy has been coalesced, it will be found by the same loop changed by this patch, and the optimization is aborted. This was exposed by 400.perlbench and lua after applying a patch that deletes joined copies aggressively. llvm-svn: 157130
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