Disable default PassGlobalVariable

Author: foxtran

flang/lib/Support/Fortran-features.cpp

@@ -149,7 +149,6 @@ LanguageFeatureControl::LanguageFeatureControl() {
   warnUsage_.set(UsageWarning::HostAssociatedIntentOutInSpecExpr);
   warnUsage_.set(UsageWarning::NonVolatilePointerToVolatile);
   warnUsage_.set(UsageWarning::RealConstantWidening);
-  warnUsage_.set(UsageWarning::PassGlobalVariable);
   // New warnings, on by default
   warnLanguage_.set(LanguageFeature::SavedLocalInSpecExpr);
   warnLanguage_.set(LanguageFeature::NullActualForAllocatable);