[llvm] [IR] Memory locations for floating-point operations (PR #226826)

[via llvm-commits]

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@@ -285,7 +285,7 @@ static void addMemoryAttrs(const SCCNodeSet &SCCNodes, AARGetterT &&AARGetter,
     ME |= FnME;
     RecursiveArgME |= FnRecursiveArgME;
     // Reached bottom of the lattice, we will not be able to improve the result.
-    if (ME == MemoryEffects::unknown())
+    if (ME == MemoryEffects::unknown_mem())
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CarolineConcatto wrote:

For all  the Transform changes if you keep this checking MemoryEffects::unknown() and the memory set(ME = MemoryEffects(ME.getModRef());) you still set all locations, what would be a problem? 
 I dont understand what is the problem of setting all bits for now and checking all bits for the memory location.

https://github.com/llvm/llvm-project/pull/226826