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[TailCallElim] Add tailcall elimination pass to LTO pipelines

Authored by rob.lougher on Mar 19 2019, 1:24 PM.

Description

[TailCallElim] Add tailcall elimination pass to LTO pipelines

LTO provides additional opportunities for tailcall elimination due to
link-time inlining and visibility of nocapture attribute. Testing showed
negligible impact on compilation times.

Differential Revision: https://reviews.llvm.org/D58391

llvm-svn: 356511