Revert "The global invariant pragma must not leak across compilations."

This reverts commit ae2e19188cf0a9b035a27143f585df10e72ffabd.

Change-Id: I017ba4ba9baa633793d7bdd9691c580ed7016cde
Reviewed-on: https://chromium-review.googlesource.com/358410
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
diff --git a/src/compiler/translator/SymbolTable.h b/src/compiler/translator/SymbolTable.h
index a3ca98f..6de7c98 100644
--- a/src/compiler/translator/SymbolTable.h
+++ b/src/compiler/translator/SymbolTable.h
@@ -469,7 +469,8 @@
               mInvariantVaryings.count(originalName) > 0);
     }
 
-    void setGlobalInvariant(bool invariant) { mGlobalInvariant = invariant; }
+    void setGlobalInvariant() { mGlobalInvariant = true; }
+    bool getGlobalInvariant() const { return mGlobalInvariant; }
 
     static int nextUniqueId()
     {