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/VersionGLSL.h b/src/compiler/translator/VersionGLSL.h
index c41069d..f03a48b 100644
--- a/src/compiler/translator/VersionGLSL.h
+++ b/src/compiler/translator/VersionGLSL.h
@@ -58,6 +58,7 @@
 
     void visitSymbol(TIntermSymbol *) override;
     bool visitAggregate(Visit, TIntermAggregate *) override;
+    bool visitDeclaration(Visit, TIntermDeclaration *node) override;
 
   private:
     void ensureVersionIsAtLeast(int version);