add sema check

Author: Keenuts

clang/test/SemaHLSL/Semantics/struct_input.hlsl

@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -x hlsl -finclude-default-header -o - %s -verify
+
+struct S {
+  float4 f0 : SV_Position;
+// expected-error@+2 {{semantic annotations must be present for all parameters of an entry function or patch constant function}}
+// expected-note@+1 {{'f1' used here}}
+  float4 f1;
+};
+
+[shader("pixel")]
+// expected-note@+1 {{'s' declared here}}
+void main(S s) {
+}
+
+[shader("pixel")]
+// expected-error@+2 {{semantic annotations must be present for all parameters of an entry function or patch constant function}}
+// expected-note@+1 {{'f' declared here}}
+void main2(float4 p : SV_POSITION, float4 f)
+{ }