Split TIntermDeclaration from TIntermAggregate

The new class TIntermDeclaration is now used for struct, interface
block and variable declarations. TIntermDeclaration nodes do not have
a type - rather the type is stored in each child node. The types may
differ in case the declaration is a series of array declarators with
mismatching sizes.

TIntermAggregate is still used for function calls, function
prototypes, function parameter lists and invariant declarations.

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: I0457188f354481470855f61ac1c878fc2579b1d1
Reviewed-on: https://chromium-review.googlesource.com/400023
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/compiler/translator/DeferGlobalInitializers.cpp b/src/compiler/translator/DeferGlobalInitializers.cpp
index 067e6ce..5a12238 100644
--- a/src/compiler/translator/DeferGlobalInitializers.cpp
+++ b/src/compiler/translator/DeferGlobalInitializers.cpp
@@ -111,7 +111,7 @@
             if (symbolNode->getQualifier() == EvqConst)
             {
                 // All of the siblings in the same declaration need to have consistent qualifiers.
-                auto *siblings = getParentNode()->getAsAggregate()->getSequence();
+                auto *siblings = getParentNode()->getAsDeclarationNode()->getSequence();
                 for (TIntermNode *siblingNode : *siblings)
                 {
                     TIntermBinary *siblingBinary = siblingNode->getAsBinaryNode();