1. Try to propagate if the pointer is only write once by the memcpy.
2. Use correct size for memcpy created in AppendBuffer::Append.
3. Ignore unused Constant user of Matrix value.
4. Replace Constant with Inst on the Instruction version of Constant.
5. When match size of memcpy, go deeper if struct only has 1 element.
Doing this will leave memcpy be lowered at deeper level.
6. Do not replace when SimplePtrCopy, cannot decide replace is safe or not.
1. Keep major for matrix pointers.
2. Change matrix values to row major to match hlsl.
Only ColMatLoad, RowMatrixToColMatrix and col matrix value parameter for entry function are col major matrix value.
And should only used by ColMatStore and ColMatrixToRowMatrix.
* Save imm initializer when possible.
* Remove UpdateHLSLIncompleteArrayType which already done in SemaInit.
* Take care parent record in AddMissingCastOpsInInitList and HLSLExternalSource::GetNumBasicElements.
* Support nest init list in CaculateInitListArraySizeForHLSL.
Xiang Li
Tex Riddell
Marcelo Lopez Ruiz