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[CodeGen] Do the Simple Early Return in block-placement pass to optim…
…ize the blocks Summary: In `block-placement` pass, it will create some patterns for unconditional we can do the simple early retrun. But the `early-ret` pass is before `block-placement`, we don't want to run it again. This patch is to do the simple early return to optimize the blocks at the last of `block-placement`. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D63972 llvm-svn: 368565
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