xfail only when spirv-tools is enabled, add issue number

Author: kmpeng

llvm/test/CodeGen/SPIRV/hlsl-intrinsics/SV_GroupIndex.ll

@@ -1,8 +1,8 @@
 ; RUN: llc -O0 -verify-machineinstrs -mtriple=spirv-vulkan-unknown %s -o - | FileCheck %s
 ; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-vulkan-unknown %s -o - -filetype=obj | spirv-val --target-env vulkan1.3 %}
 
-; TODO: This test currently fails when --target-env vulkan1.3 is specified.
-; XFAIL: *
+; TODO(#136344): This test currently fails when --target-env vulkan1.3 is specified.
+; XFAIL: spirv-tools
 
 ; CHECK-DAG:        %[[#int:]] = OpTypeInt 32 0
 ; CHECK-DAG:        %[[#ptr_Input_int:]] = OpTypePointer Input %[[#int]]

llvm/test/CodeGen/SPIRV/hlsl-intrinsics/smoothstep.ll

@@ -1,8 +1,8 @@
 ; RUN: llc -O0 -verify-machineinstrs -mtriple=spirv-unknown-unknown %s -o - | FileCheck %s
 ; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - -filetype=obj | spirv-val --target-env vulkan1.3 %}
 
-; TODO: This test currently fails when --target-env vulkan1.3 is specified.
-; XFAIL: *
+; TODO(#136344): This test currently fails when --target-env vulkan1.3 is specified.
+; XFAIL: spirv-tools
 
 ; Make sure SPIRV operation function calls for smoothstep are lowered correctly.