[llvm] [flang] [clang] [NFC][AMDGPU] Move address space enum to LLVM directory (PR #73944)

[Sergio Afonso via cfe-commits]

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@@ -405,9 +398,9 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUTargetInfo final : public TargetInfo {
   getDWARFAddressSpace(unsigned AddressSpace) const override {
     const unsigned DWARF_Private = 1;
     const unsigned DWARF_Local = 2;
-    if (AddressSpace == Private) {
+    if (AddressSpace == llvm::AMDGPU::Private) {
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skatrak wrote:

Nit: switch?

https://github.com/llvm/llvm-project/pull/73944