Add support for new JointMatrix PackedLayout.

This change adds support for the JointMatrix packed layout from the
current version of the specification. The new layout is mostly
compatible with legacy layout combinations. However there is one case
that needed a slight addjustment.

Author: mbelicki

IGC/Compiler/Optimizer/OpenCLPasses/JointMatrixFuncsResolutionPass.cpp

@@ -139,6 +139,16 @@ std::string JointMatrixFuncsResolutionPass::GetLoadStoreMatrixFuncName
         IGC_ASSERT_MESSAGE(false, "Unexpected matrix layout.");
     }
 
+    /* New version of the JointMatrix specification uses single value to
+     * represent PackedA and PackedB layouts, named simply; 'Packed'. The value
+     * of 'Paccked' is equal to the value of legacy 'PackedA'. If we meet
+     * load/store that tries to load/store packedA data into B matrix, we can
+     * assume that the intended layout was PackedB (load of A into B would be illegal).
+     * This should be removed when we stop to support the legacy version of the spec. */
+    if (matrixLayout == LayoutPackedB && operationLayout == LayoutPackedA) {
+        operationLayout = LayoutPackedB;
+    }
+
     switch (operationLayout) {
       case LayoutRowMajor:
         name += "RowMajor_";