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Fix logic around determining use of frame pointer with -pg.

Description

Fix logic around determining use of frame pointer with -pg.

Summary:
As part of r342165, I rewrote the logic to check whether
-fno-omit-frame-pointer was passed after a -fomit-frame-pointer
argument. This CL switches that logic to use the consolidated
shouldUseFramePointer() function. This fixes a potential issue where -pg
gets used with -fomit-frame-pointer on a platform that must always retain
frame pointers.

Reviewers: dblaikie

Reviewed By: dblaikie

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D52191