Add possibility to control partial component packing via shader metadata.

Change-Id: I9fb34374e3c9fa7d6d1d01abf34f40bc4fff995d

Author: mmerecki

IGC/Compiler/CISACodeGen/VertexShaderCodeGen.cpp

@@ -120,7 +120,8 @@ namespace IGC
 
     void CVertexShader::PackVFInput(unsigned int index, unsigned int& offset)
     {
-        bool dontPackPartialElement = IGC_IS_FLAG_ENABLED(VFPackingDisablePartialElements);
+        bool dontPackPartialElement = m_ModuleMetadata->compOpt.disablePartialVertexComponentPacking ||
+            IGC_IS_FLAG_ENABLED(VFPackingDisablePartialElements);
         if (dontPackPartialElement)
         {
             if (m_ElementComponentEnableMask[index / 4] == 0)

IGC/common/MDFrameWork.h

@@ -214,6 +214,7 @@ namespace IGC
         bool pixelShaderDoNotAbortOnSpill               = false;
         bool UniformWGS                                 = false;
         bool disableVertexComponentPacking              = false;
+        bool disablePartialVertexComponentPacking       = false;
         bool PreferBindlessImages                       = false;
         bool disableMathRefactoring                     = false;
         bool EnableTakeGlobalAddress                    = false;