[OptDiag] Take the IR Value as a const pointer

This helps because LoopAccessReport is passed around as a const
reference and we derive the basic block passed as the Value parameter
from the instruction in LoopAccessReport.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276191 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed