[NVPTX] Fix ptxas requirements

\#159388 caused some test failures for us internally:

exit status 255
ptxas /tmp/tmpxft_000026cd_00000000-0_stdin, line 37; error   : Feature 'used_bytes_mask' requires PTX ISA .version 8.3 or later
ptxas /tmp/tmpxft_000026cd_00000000-0_stdin, line 37; error   : Feature 'used_bytes_mask' requires .target sm_50 or higher
ptxas fatal   : Ptx assembly aborted due to errors

Add some requirements/versions to get things working.

Author: boomanaiden154

llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll

@@ -1,8 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
 ; RUN: llc < %s | FileCheck -check-prefix=ENABLED %s
 ; RUN: llc -disable-nvptx-load-store-vectorizer < %s | FileCheck -check-prefix=DISABLED %s
-; RUN: %if ptxas %{ llc < %s | %ptxas-verify %}
-; RUN: %if ptxas %{ llc -disable-nvptx-load-store-vectorizer < %s | %ptxas-verify %}
+; RUN: %if ptxas-sm_50 && ptxas-isa-8.3 %{ llc -mcpu=sm_50 < %s | %ptxas-verify -arch=sm_50 %}
+; RUN: %if ptxas-sm_50 && ptxas-isa-8.3 %{ llc -mcpu=sm_50 -disable-nvptx-load-store-vectorizer < %s | %ptxas-verify -arch=sm_50 %}
 
 target triple = "nvptx64-nvidia-cuda"
 

llvm/test/CodeGen/NVPTX/param-vectorize-device.ll

@@ -1,5 +1,5 @@
 ; RUN: llc < %s -mtriple=nvptx64-unknown-unknown | FileCheck %s
-; RUN: %if ptxas %{ llc < %s -mtriple=nvptx64-unknown-unknown | %ptxas-verify %}
+; RUN: %if ptxas-sm_50 && ptxas-isa-8.3 %{ llc < %s -mtriple=nvptx64-unknown-unknown -mcpu=sm_50 | %ptxas-verify -arch=sm_50 %}
 ;
 ; Check that parameters of a __device__ function with private or internal
 ; linkage called from a __global__ (kernel) function get increased alignment,