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This also simplifies the code by removing the overly conservative NoInterveningSideEffect() function. This function checked: - That the two copies belong to the same block: We only process one block at a time and clear our maps in between it is impossible to find a copy from a different block. - There is no terminator between the two copy instructions: This is not allowed anyway (the MachineVerifier would complain) - Does not have instructions with hasUnmodeledSideEffects() or isCall() set: Even for those instructuction we must have all clobbers/defs of registers explicit as an operand. If the register is explicitely clobbered we would never come to the point of checking for NoInterveningSideEffect() anyway. (I also checked this with a temporary build of the test-suite with all potentially failing conditions in NoInterveningSideEffect() turned into asserts) Differential Revision: http://reviews.llvm.org/D17474 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261965 91177308-0d34-0410-b5e6-96231b3b80d8
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