Add a sycl-post-link test

Author: jchlanda

llvm/test/tools/sycl-post-link/emit_intel_reqd_sub_group_size.ll

@@ -0,0 +1,24 @@
+; This test checks that the sycl-post-link tool correctly handles
+; intel_reqd_sub_group_siz metadata.
+
+; RUN: sycl-post-link -properties -emit-program-metadata -device-globals -S < %s -o %t.files.table
+; RUN: FileCheck %s -input-file=%t.files.table --check-prefixes CHECK-TABLE
+; RUN: FileCheck %s -input-file=%t.files_0.prop --match-full-lines --check-prefixes CHECK-PROP
+
+target triple = "amdgcn-amd-amdhsa"
+
+!0 = !{i32 64}
+
+define weak_odr amdgpu_kernel void @_ZTS7Kernel1(float %arg1) !intel_reqd_sub_group_size !0 {
+  call void @foo(float %arg1)
+  ret void
+}
+
+declare void @foo(float)
+
+; CHECK-PROP: [SYCL/program metadata]
+; CHECK-PROP-NEXT: _ZTS7Kernel1@reqd_sub_group_size=1|64
+
+; CHECK-TABLE: [Code|Properties]
+; CHECK-TABLE-NEXT: {{.*}}files_0.prop
+; CHECK-TABLE-EMPTY: