[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:

@arsenm made a point in 
https://github.com/llvm/llvm-project/pull/108594#discussion_r1759254548 that, 
address space is already defined as a 24-bit int, `~0U` should not carry 
anything. I'm fine either way.

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