[MLIR][NVVM] Print ptxas path

Author: grypp

mlir/lib/Target/LLVM/NVVM/Target.cpp

@@ -455,6 +455,7 @@ NVPTXSerializer::compileToBinary(const std::string &ptxCode) {
   LLVM_DEBUG({
     llvm::dbgs() << "Tool invocation for module: "
                  << getOperation().getNameAttr() << "\n";
+    llvm::dbgs() << "ptxas executable:" << ptxasCompiler.value() << "\n";
     llvm::interleave(ptxasArgs, llvm::dbgs(), " ");
     llvm::dbgs() << "\n";
     if (createFatbin) {

mlir/test/Integration/GPU/CUDA/command-line-arg.mlir

@@ -16,6 +16,7 @@ func.func @host_function(%arg0 : f32, %arg1 : memref<?xf32>) {
     return
 }
 
+// CHECK: ptxas executable:
 // CHECK: ptxas -arch sm_80
 // CHECK-SAME: -v 
 // CHECK-SAME: --register-usage-level=8