[llvm] [GVN] Look through select/phi when determining underlying object (PR #99509)

[Thorsten Schütt via llvm-commits]

================
@@ -736,6 +736,11 @@ inline Value *getUnderlyingObject(Value *V, unsigned MaxLookup = 6) {
   return const_cast<Value *>(getUnderlyingObject(VConst, MaxLookup));
 }
 
+/// Like getUnderlyingObject(), but will try harder to find a single underlying
+/// object. In particular, this function also looks through selects and phis.
----------------
tschuett wrote:

Could you please document `MaxLookup`.

https://github.com/llvm/llvm-project/pull/99509