[PATCH] D27280: [PGO] fix PGO use ICE when there are unreachable BBs

[Rong Xu via Phabricator via llvm-commits]

xur created this revision.
xur added reviewers: davidxl, vsk.
xur added subscribers: llvm-commits, xur, rob.lougher.

For -O0 there might be unreachable BBs, which breaks the assumption that all the BBs have an auxiliary data structure.  In this patch, I change the interface for getBBInfo() so that a nullptr can be returned for the unreachable BBs (and the callers can ignore those BBs).

This fixes the bug reported
https://llvm.org/bugs/show_bug.cgi?id=31209


https://reviews.llvm.org/D27280

Files:
  lib/Transforms/Instrumentation/CFGMST.h
  lib/Transforms/Instrumentation/PGOInstrumentation.cpp
  test/Transforms/PGOProfile/Inputs/unreachable_bb.proftext
  test/Transforms/PGOProfile/unreachable_bb.ll

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