James Molloy 0f41227b21 [Thumb1] Teach optimizeCompareInstr about thumb1 compares ...

This avoids us doing a completely unneeded "cmp r0, #0" after a flag-setting instruction if we only care about the Z or C flags.

Add LSL/LSR to the whitelist while we're here and add testing. This code could really do with a spring clean.

llvm-svn: 281027

2016-09-09 09:51:06 +00:00

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