[clang] [CIR][CUDA] Shadow variables, internalize device side variables, lower poison attribute (PR #190087)

[Zaky Hermawan via cfe-commits]

================
@@ -26,6 +26,7 @@
 #include "mlir/IR/BuiltinAttributes.h"
 #include "mlir/IR/BuiltinDialect.h"
 #include "mlir/IR/BuiltinOps.h"
+#include "mlir/IR/Location.h"
----------------
ZakyHermawan wrote:

clangd says: `Location.h` provides `FileLineColLoc`, `FusedLoc`, `Location`, `UnknownLoc`
Also, I think it is a good idea to `include-what-you-use`

https://github.com/llvm/llvm-project/pull/190087