[PATCH] D13914: Tolerate negative offset when matching sample profile.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added reviewers: dnovillo, davidxl.
danielcdh added a subscriber: llvm-commits.

In some cases (as illustrated in the unittest), lineno can be less than the heade_lineno because the function body are included from some other files. In this case, offset will be negative. This patch makes clang still able to match the profile to IR in this situation.

http://reviews.llvm.org/D13914

Files:
  lib/Transforms/IPO/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/offset.prof
  test/Transforms/SampleProfile/offset.ll

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