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/InitializeVariables.cpp b/src/compiler/translator/InitializeVariables.cpp
index 8332385..4fdcea1 100644
--- a/src/compiler/translator/InitializeVariables.cpp
+++ b/src/compiler/translator/InitializeVariables.cpp
@@ -25,7 +25,7 @@
   protected:
     bool visitBinary(Visit, TIntermBinary *node) override { return false; }
     bool visitUnary(Visit, TIntermUnary *node) override { return false; }
-    bool visitSelection(Visit, TIntermSelection *node) override { return false; }
+    bool visitIfElse(Visit, TIntermIfElse *node) override { return false; }
     bool visitLoop(Visit, TIntermLoop *node) override { return false; }
     bool visitBranch(Visit, TIntermBranch *node) override { return false; }