add test-case for specifying the version at it being correclty generated

Author: inbelic

clang/test/Driver/dxc_hlsl-rootsig-ver.hlsl

@@ -0,0 +1,15 @@
+// RUN: %clang_dxc -T cs_6_0 -fcgl %s | FileCheck %s --check-prefix=CHECK-V1_1
+// RUN: %clang_dxc -T cs_6_0 -fcgl -hlsl-rootsig-ver rootsig_1_0 %s | FileCheck %s --check-prefix=CHECK-V1_0
+// RUN: %clang_dxc -T cs_6_0 -fcgl -hlsl-rootsig-ver rootsig_1_1 %s | FileCheck %s --check-prefix=CHECK-V1_1
+
+// Test to demonstrate that we can specify the root-signature versions
+
+// CHECK: !dx.rootsignatures = !{![[#EMPTY_ENTRY:]]}
+// CHECK: ![[#EMPTY_ENTRY]] = !{ptr @EmptyEntry, ![[#EMPTY:]],
+// CHECK-V1_0: i32 1}
+// CHECK-V1_1: i32 2}
+// CHECK: ![[#EMPTY]] = !{}
+
+[shader("compute"), RootSignature("")]
+[numthreads(1,1,1)]
+void EmptyEntry() {}