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[DWARF] Null out the debug locs of (loop invariant) instructions hoisted by…

Authored by wolfgangp on Jan 6 2017, 10:38 AM.

Description

[DWARF] Null out the debug locs of (loop invariant) instructions hoisted by LICM in order to avoid jumpy line tables. Calls are left alone because they may be inlined.

Differential Revision: https://reviews.llvm.org/D28390

llvm-svn: 291258