[clang] [llvm] [NVPTX] Change the alloca address space in NVPTXLowerAlloca (PR #154814)

[Alex MacLean via cfe-commits]

================
@@ -46,21 +46,11 @@ void NVPTXFrameLowering::emitPrologue(MachineFunction &MF,
 
     // Emits
     //   mov %SPL, %depot;
-    //   cvta.local %SP, %SPL;
     // for local address accesses in MF.
-    bool Is64Bit =
-        static_cast<const NVPTXTargetMachine &>(MF.getTarget()).is64Bit();
-    unsigned CvtaLocalOpcode =
-        (Is64Bit ? NVPTX::cvta_local_64 : NVPTX::cvta_local);
+    bool IsLocal64Bit = static_cast<const NVPTXTargetMachine &>(MF.getTarget())
+                            .getPointerSize(NVPTXAS::ADDRESS_SPACE_LOCAL) == 8;
----------------
AlexMaclean wrote:

Is this cast required?

https://github.com/llvm/llvm-project/pull/154814
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