Separate function info from TIntermAggregate

This change will make it easier to split types of TIntermAggregate
nodes representing functions and function calls into different node
classes.

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: I730aa7858fe31fda86218fc685980c6ad486f5e0
Reviewed-on: https://chromium-review.googlesource.com/394706
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/compiler/translator/Compiler.cpp b/src/compiler/translator/Compiler.cpp
index 2ac8528..0fab6f8 100644
--- a/src/compiler/translator/Compiler.cpp
+++ b/src/compiler/translator/Compiler.cpp
@@ -769,7 +769,7 @@
             return false;
         }
 
-        size_t callDagIndex = mCallDag->findIndex(asAggregate);
+        size_t callDagIndex = mCallDag->findIndex(asAggregate->getFunctionSymbolInfo());
         if (callDagIndex == CallDAG::InvalidIndex)
         {
             // This happens only for unimplemented prototypes which are thus unused