[llvm] [InferAddressSpaces] Handle unconverted ptrmask (PR #140802)

[Matt Arsenault via llvm-commits]

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@@ -151,6 +152,54 @@ class TargetTransformInfoImplBase {
   }
 
   virtual bool isNoopAddrSpaceCast(unsigned, unsigned) const { return false; }
+
+  // Given an address space cast of the given pointer value, calculate the known
+  // bits of the source pointer in the source addrspace and the destination
+  // pointer in the destination addrspace.
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arsenm wrote:

Should pull this documentation up into the top-level API entry in TargetTransformInfo.h 

https://github.com/llvm/llvm-project/pull/140802