Rong Xu 31bd15c562 [PGO][InstrProf] Do not promote count if the exit blocks contains ret instruction ...

Skip profile count promotion if any of the ExitBlocks contains a ret
instruction. This is to prevent dumping of incomplete profile -- if the
the loop is a long running loop and dump is called in the middle
of the loop, the result profile is incomplete.

ExitBlocks containing a ret instruction is an indication of a long running
loop -- early exit to error handling code.

Differential Revision: https://reviews.llvm.org/D84379

2020-07-24 17:38:31 -07:00

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