[clang] [llvm] Extend MemoryEffects to Support Target-Specific Memory Locations (PR #148650)

[Paul Walker via llvm-commits]

================
@@ -66,10 +66,16 @@ enum class IRMemLocation {
   ErrnoMem = 2,
   /// Any other memory.
   Other = 3,
+  /// Target Memory Location
+  /// Used by a target to represent target specif memory regions
----------------
paulwalker-arm wrote:

```suggestion
  /// Represents target specific state.
```

https://github.com/llvm/llvm-project/pull/148650