================
@@ -245,6 +246,7 @@ class DataLayout {
   unsigned getDefaultGlobalsAddressSpace() const {
     return DefaultGlobalsAddrSpace;
   }
+  unsigned getFlatAddressSpace() const { return FlatAddressSpace; }
----------------
shiltian wrote:

It is optional from a target's perspective, but the expectation is indeed that 
to check against `~0U` because it represents invalid address space. I will put 
a comment there.

https://github.com/llvm/llvm-project/pull/108786
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