Add common prefix and update test

Author: pmatos

llvm/test/CodeGen/SPIRV/extensions/SPV_INTEL_optnone.ll

@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
-; RUN: llc -O0 -mtriple=spirv32-unknown-unknown --spirv-extensions=SPV_INTEL_optnone %s -o - | FileCheck %s --check-prefix=CHECK-EXTENSION
-; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-NO-EXTENSION
+; RUN: llc -O0 -mtriple=spirv32-unknown-unknown --spirv-extensions=SPV_INTEL_optnone %s -o - | FileCheck %s --check-prefix=CHECK,CHECK-EXTENSION
+; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK,CHECK-NO-EXTENSION
 
 ; CHECK-EXTENSION: OpCapability OptNoneINTEL
 ; CHECK-EXTENSION: OpExtension "SPV_INTEL_optnone"
@@ -13,19 +13,16 @@
 
 ; Function Attrs: nounwind optnone noinline
 define spir_func void @_Z3foov() #0 {
-; CHECK-EXTENSION-LABEL: _Z3foov:
-; CHECK-EXTENSION:       %4 = OpFunction %2 DontInline %3
-; CHECK-EXTENSION-NEXT:    %5 = OpLabel
-; CHECK-EXTENSION-NEXT:    OpReturn
-; CHECK-EXTENSION-NEXT:    OpFunctionEnd
-;
-; CHECK-NO-EXTENSION-LABEL: _Z3foov:
-; CHECK-NO-EXTENSION:       %4 = OpFunction %2 DontInline %3
-; CHECK-NO-EXTENSION-NEXT:    %5 = OpLabel
-; CHECK-NO-EXTENSION-NEXT:    OpReturn
-; CHECK-NO-EXTENSION-NEXT:    OpFunctionEnd
+; CHECK-LABEL: _Z3foov:
+; CHECK:       %4 = OpFunction %2 DontInline %3
+; CHECK-NEXT:    %5 = OpLabel
+; CHECK-NEXT:    OpReturn
+; CHECK-NEXT:    OpFunctionEnd
 entry:
   ret void
 }
 
 attributes #0 = { nounwind optnone noinline }
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; CHECK-EXTENSION: {{.*}}
+; CHECK-NO-EXTENSION: {{.*}}