Fix missing patch decoration for TessFactor PCF arg (#2249)

Test/hlsl.hull.6.tesc

+// Test tesselation factor output as PCF arg
+
+struct VSOutput
+{
+    float4 f4Position : SV_Position;
+    float3 f3Color	  : COLOR;
+};
+
+struct HS_CONSTANT_DATA_OUTPUT
+{
+    float Edges[4]  : SV_TessFactor;
+};
+
+HS_CONSTANT_DATA_OUTPUT ConstantHS(InputPatch<VSOutput, 1> p, 
+                                   uint BlockID        : SV_PrimitiveID,
+                                   out float Inside[2] : SV_InsideTessFactor)
+{
+    HS_CONSTANT_DATA_OUTPUT Factors;
+    Factors.Edges[0] = 2.5;
+    Factors.Edges[1] = 4.25;
+    Factors.Edges[2] = 5.75;
+    Factors.Edges[3] = 7.5;
+
+    Inside[0] = 6.75;
+    Inside[1] = 7.25;
+
+    return Factors;
+}
+
+struct HSOutput
+{
+    float4 Position : POS;
+    float3 Color    : COL;
+};
+
+[domain("quad")]
+[partitioning("fractional_even")]
+[outputtopology("triangle_ccw")]
+[outputcontrolpoints(1)]
+[patchconstantfunc("ConstantHS")]
+HSOutput main(InputPatch<VSOutput, 1> inputPatch, uint uCPID : SV_OutputControlPointID)
+{
+    HSOutput Out;
+    Out.Position = inputPatch[uCPID].f4Position;
+    Out.Color    = inputPatch[uCPID].f3Color;
+    return Out;
+}
+

gtests/Hlsl.FromFile.cpp

@@ -227,6 +227,7 @@ INSTANTIATE_TEST_CASE_P(
         {"hlsl.hull.3.tesc", "main"},
         {"hlsl.hull.4.tesc", "main"},
         {"hlsl.hull.5.tesc", "main"},
+        {"hlsl.hull.6.tesc", "main"},
         {"hlsl.hull.void.tesc", "main"},
         {"hlsl.hull.ctrlpt-1.tesc", "main"},
         {"hlsl.hull.ctrlpt-2.tesc", "main"},

hlsl/hlslParseHelper.cpp

@@ -9791,6 +9791,8 @@ void HlslParseContext::addPatchConstantInvocation()
                 } else {
                     // Use the original declaration type for the linkage
                     paramType->getQualifier().builtIn = biType;
+                    if (biType == EbvTessLevelInner || biType == EbvTessLevelInner)
+                        paramType->getQualifier().patch = true;
 
                     if (notInEntryPoint.count(tInterstageIoData(biType, storage)) == 1)
                         addToLinkage(*paramType, patchConstantFunction[p].name, nullptr);