Add phase to disable globopt for generators

Author: nhat-nguyen

lib/Backend/Func.h

@@ -206,7 +206,7 @@ class Func
             !PHASE_OFF(Js::GlobOptPhase, this) && !IsSimpleJit() &&
             (!GetTopFunc()->HasTry() || GetTopFunc()->CanOptimizeTryCatch()) &&
             (!GetTopFunc()->HasFinally() || GetTopFunc()->CanOptimizeTryFinally()) &&
-            !GetTopFunc()->GetJITFunctionBody()->IsCoroutine();
+            (!GetTopFunc()->GetJITFunctionBody()->IsCoroutine() || !PHASE_OFF(Js::GeneratorGlobOptPhase, this));
     }
 
     bool DoInline() const

lib/Common/ConfigFlagsList.h

@@ -325,6 +325,7 @@ PHASE(All)
         PHASE(Host)
         PHASE(BailOut)
         PHASE(BailIn)
+        PHASE(GeneratorGlobOpt)
         PHASE(RegexQc)
         PHASE(RegexOptBT)
         PHASE(InlineCache)