HLSL: Fix #1203: Declare anonymous members for cbuffer with no ';'

The grammar for no semicolon and no object name for cbuffer/tbuffer
was correct, but the production still skipped the anonymous declarations
if an identifier followed.

Test/hlsl.buffer.frag

@@ -31,7 +31,17 @@ float foo() // float looks like identifier, but can't be part of tbuffer
     return 1.0;
 }
 
-float4 PixelShaderFunction(float4 input : SV_POSITION) : SV_TARGET0
-{
-    return (input + v1 + v2 + v3 + v4) * foo();
+struct id {
+    float4 a;
+};
+
+cbuffer cbufName2 {
+    float4 v24;
+}
+
+id PixelShaderFunction(float4 input : SV_POSITION) : SV_TARGET0  // id looks like id for cbuffer name, but can't be
+{
+    id ret;
+    ret.a = v24 + (input + v1 + v2 + v3 + v4) * foo();
+    return ret;
 }