Evan Cheng 0be4144a68 Allow machine-cse to look across MBB boundary when cse'ing instructions that ...

define physical registers. It's currently very restrictive, only catching
cases where the CE is in an immediate (and only) predecessor. But it catches
a surprising large number of cases.

rdar://10660865

llvm-svn: 147827

2012-01-10 02:02:58 +00:00

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