Rename TIntermSelection to TIntermIfElse

Now that ternary nodes are not represented by TIntermSelection any
more, TIntermIfElse is an easier name to understand for newcomers to
the code.

BUG=angleproject:1490
TEST=angle_unittests

Change-Id: Ia1e04e356ab93409400245092a84533d7dfd129d
Reviewed-on: https://chromium-review.googlesource.com/385416
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/compiler/translator/ValidateSwitch.cpp b/src/compiler/translator/ValidateSwitch.cpp
index 9fe9b5d..1ebdffd 100644
--- a/src/compiler/translator/ValidateSwitch.cpp
+++ b/src/compiler/translator/ValidateSwitch.cpp
@@ -71,7 +71,7 @@
     return true;
 }
 
-bool ValidateSwitch::visitSelection(Visit visit, TIntermSelection *)
+bool ValidateSwitch::visitIfElse(Visit visit, TIntermIfElse *)
 {
     if (visit == PreVisit)
         ++mControlFlowDepth;