Modify Mozilla - break before binary operator

[Abpostelnicu]

Summary

We at Mozilla want to update the coding style that is used for the Mozilla format in order to make it compliant with our coding style guidelines: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Operators

This revision is addressed to fix the following situations when the correct format should be changed from:

MOZ_ASSERT(!mChild && !(mBits & nsCachedStyleData::GetBitForSID(aSID)) &&
           !GetCachedStyleData(aSID),
           "bar");

MOZ_ASSERT(!mChild && !(mBits & nsCachedStyleData::GetBitForSID(aSID))
             && !GetCachedStyleData(aSID),
           "bar");

[sylvestre.ledru]

Please don't accept it yet. Seems that there is no consensus yet

lib/Format/Format.cpp

   MozillaStyle.AlwaysBreakTemplateDeclarations = true;
   MozillaStyle.BinPackParameters = false;
   MozillaStyle.BinPackArguments = false;
+  MozillaStyle.BreakBeforeBinaryOperators = FormatStyle::BOS_All;
   MozillaStyle.BreakBeforeBraces = FormatStyle::BS_Mozilla;
   MozillaStyle.BreakConstructorInitializersBeforeComma = true;
   MozillaStyle.ConstructorInitializerIndentWidth = 2;