add -Gis

Author: bob80905

test/Feature/HLSLLib/distance.fp16.denorm.test

@@ -89,5 +89,5 @@ DescriptorSets:
 # UNSUPPORTED: Clang-Vulkan
 # REQUIRES: Half
 # RUN: split-file %s %t
-# RUN: %dxc_target -enable-16bit-types -T cs_6_5 -Fo %t.o %t/source.hlsl
+# RUN: %dxc_target -enable-16bit-types -Gis -T cs_6_5 -Fo %t.o %t/source.hlsl
 # RUN: %offloader %t/pipeline.yaml %t.o