[NVPTX] disable combine-mad test for newer ptxas (#93919)

Author: AlexMaclean

llvm/test/CodeGen/NVPTX/combine-mad.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
 ; RUN: llc < %s -mtriple=nvptx -mcpu=sm_20 -O1 | FileCheck %s
 ; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_20 -O1 | FileCheck %s
-; RUN: %if ptxas %{ llc < %s -mtriple=nvptx -mcpu=sm_20 -O1 | %ptxas-verify %}
+; RUN: %if ptxas && !ptxas-12.0 %{ llc < %s -mtriple=nvptx -mcpu=sm_20 -O1 | %ptxas-verify %}
 ; RUN: %if ptxas %{ llc < %s -mtriple=nvptx64 -mcpu=sm_20 -O1 | %ptxas-verify %}
 
 define i32 @test1(i32 %n, i32 %m) {