This fixes a bug in the analyzer where it did not push the SHADOWED_VARIABLE_BASE_CLASS
warning for members shadowed by variable in subclass. It does this by comparing the class
which contains the shadowed member with the class containing the variable, and pushing
SHADOWED_VARIABLE only if the classes are the same. Additionally, SHADOWED_VARIABLE_BASE_CLASS
can take an extra symbol which helps to specify the line for non native base class.
