[clang] [lld] [llvm] [mlir] [IR] Introduce `T` to `DataLayout` to represent flat address space if a target supports it (PR #108786)

[Shilei Tian via cfe-commits]

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

I added an enum such that all the checks can be against 
`DataLayout::AS_INVALID`.

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