This computes a structural hash while allowing for selective ignoring of
certain operands based on a custom function that is provided. Instead of
a single hash value, it now returns FunctionHashInfo which includes a
hash value, an instruction mapping, and a map to track the operand
location and its corresponding hash value that is ignored.
Depends on https://github.com/llvm/llvm-project/pull/112621.
This is a patch for
https://discourse.llvm.org/t/rfc-global-function-merging/82608.
This patch adds in a StructuralHash printer pass that prints out the
hexadeicmal representation of the hash of a module and all of the
functions within it.
Reviewed By: aeubanks
Differential Revision: https://reviews.llvm.org/D158317
