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Commit 6e35094b authored by Shuxin Yang's avatar Shuxin Yang
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Resurrect r191017 " GVN proceeds in the presence of dead code" plus a fix to PR17307 & 17308. 

  The problem of r191017 is that when GVN fabricate a val-number for a dead instruction (in order
to make following expr-PRE happy), it forget to fabricate a leader-table entry for it as well.

llvm-svn: 191118
parent 4b905844
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