[CIR][CUDA] Treat nvptx triple as alias for nvptx64 (#1420)

Similar to
[OG](https://github.com/llvm/clangir/blob/8746bd4bbe777352c2935e9937449637a8943767/clang/lib/CodeGen/CodeGenModule.cpp#L219)

Author: advay168

clang/lib/CIR/CodeGen/CIRGenModule.cpp

@@ -547,6 +547,7 @@ const TargetCIRGenInfo &CIRGenModule::getTargetCIRGenInfo() {
     return *(theTargetCIRGenInfo = createSPIRVTargetCIRGenInfo(genTypes));
   }
 
+  case llvm::Triple::nvptx:
   case llvm::Triple::nvptx64: {
     return *(theTargetCIRGenInfo = createNVPTXTargetCIRGenInfo(genTypes));
   }

clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp

@@ -81,8 +81,11 @@ createTargetLoweringInfo(LowerModule &LM) {
   }
   case llvm::Triple::spirv64:
     return createSPIRVTargetLoweringInfo(LM);
+
+  case llvm::Triple::nvptx:
   case llvm::Triple::nvptx64:
     return createNVPTXTargetLoweringInfo(LM);
+
   default:
     cir_cconv_unreachable("ABI NYI");
   }

clang/test/CIR/CodeGen/CUDA/simple-nvptx-triple.cu

@@ -0,0 +1,9 @@
+#include "../Inputs/cuda.h"
+
+// RUN: %clang_cc1 -triple nvptx -fclangir \
+// RUN:            -fcuda-is-device -emit-cir -target-sdk-version=12.3 \
+// RUN:            %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s
+
+__device__ void device_fn(int* a, double b, float c) {}
+// CHECK: cir.func @_Z9device_fnPidf