[PATCH] D44847: [profile] Fix value profile runtime merging issues

[Rong Xu via Phabricator via llvm-commits]

xur created this revision.
xur added a reviewer: davidxl.

This patch fixed two issues:
(1) value profile merging did not worked as the strong definition of the merge hook function never worked. We were not doing the merging of value profile. This patch remove the weak attribute and assign the hook dynamically. 
(2) in case value profile is not merged, truncated the file so that we don't have garbage in the end of the profile.


https://reviews.llvm.org/D44847

Files:
  lib/profile/InstrProfilingFile.c
  lib/profile/InstrProfilingMerge.c
  lib/profile/InstrProfilingMergeFile.c
  test/profile/instrprof-value-merge.c

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