Chris Lattner 6d277517d1
Recommit the fix for rdar://9289512 with a couple tweaks to ...
fix bugs exposed by the gcc dejagnu testsuite:
1. The load may actually be used by a dead instruction, which
would cause an assert.
2. The load may not be used by the current chain of instructions,
and we could move it past a side-effecting instruction. Change
how we process uses to define the problem away.
llvm-svn: 130018
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6d277517d1