[MIRPrinter] Print raw branch probabilities as expected by MIRParser

Fixes PR28751.

Reviewers: MatzeB, qcolombet

Subscribers: mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D26775

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287368 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed