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305ecb3495
Instruction::IsIdenticalToWhenDefined. This manifested itself when inlining two calls to the same function. The inlined function had a switch statement that returned one of a set of global variables. Without this modification, the two phi instructions that chose values from the branches of the switch instruction inlined from the callee were considered equivalent and jump-threading replaced a load for the first switch value with a phi selecting from the second switch, thereby producing incorrect code. This patch has been tested with "make check-all", "lnt runteste nt", and llvm self-hosted, and on the original program that had this problem, wireshark. <rdar://problem/11025519> llvm-svn: 156548