[Debug Info] add a template class DITypedArray.

Typedef DIArray to DITypedArray<DIDescriptor>. Also typedef DITypeArray as
DITypedArray<DITypeRef>.

This is the third of a series of patches to handle type uniqueing of the
type array for a subroutine type.

This commit should have no functionality change.

llvm-svn: 214115
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 6c06bf1..543e8e5 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -338,12 +338,6 @@
 // Simple Descriptor Constructors and other Methods
 //===----------------------------------------------------------------------===//
 
-unsigned DIArray::getNumElements() const {
-  if (!DbgNode)
-    return 0;
-  return DbgNode->getNumOperands();
-}
-
 /// replaceAllUsesWith - Replace all uses of the MDNode used by this
 /// type with the one in the passed descriptor.
 void DIType::replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D) {
@@ -676,10 +670,7 @@
 #endif
 
 /// \brief Set the array of member DITypes.
-void DICompositeType::setArrays(DIArray Elements, DIArray TParams) {
-  assert((!TParams || DbgNode->getNumOperands() == 15) &&
-         "If you're setting the template parameters this should include a slot "
-         "for that!");
+void DICompositeType::setArraysHelper(MDNode *Elements, MDNode *TParams) {
   TrackingVH<MDNode> N(*this);
   if (Elements) {
 #ifndef NDEBUG