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When fold exp(0.0) into 1.0, the Vop for the statement goes away but we don't rename the following vops which use that defined SSA_NAME. This patch just marks the vops as being used.
Thanks, Andrew Pinski
ChangeLog: * tree-ssa.c (mark_all_v_defs): New function. (replace_immediate_uses): Call the new function. (pass_redundant_phi): Add TODO_fix_def_def_chains.
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