GLSL: Fix initializing globals declared after main()

Initialize globals in a separate function instead of a block in the
beginning of main(). This way it works also for globals declared after
main().

BUG=chromium:764036
TEST=angle_end2end_tests

Change-Id: I2fcbb97d046589301287757dc3dde5471172a3f6
Reviewed-on: https://chromium-review.googlesource.com/663158
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/compiler/translator/Compiler.cpp b/src/compiler/translator/Compiler.cpp
index c7da64f..44578c1 100644
--- a/src/compiler/translator/Compiler.cpp
+++ b/src/compiler/translator/Compiler.cpp
@@ -523,7 +523,7 @@
 
         if (success)
         {
-            DeferGlobalInitializers(root, needToInitializeGlobalsInAST());
+            DeferGlobalInitializers(root, needToInitializeGlobalsInAST(), &symbolTable);
         }
 
         if (success && (compileOptions & SH_INITIALIZE_UNINITIALIZED_LOCALS) && getOutputType())