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Author SHA1 Message Date
James Molloy
98e9858311 [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