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getFirstNonPHI iterates over all the instructions in a block until it finds a non-PHI. Then, the loop starts from the beginning of the block and goes through all the instructions until it reaches the instruction found by getFirstNonPHI. Instead of doing that, just stop when a non-PHI is found. This reduces the compile-time of a test case discussed in https://reviews.llvm.org/D47023 by 13x. Not entirely sure how to come up with a test case for this since it's a compile time issue that would significantly slow down running the tests. Differential Revision: https://reviews.llvm.org/D70016
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