Migrate code translation to ANTLR

[jonathanschilling]

This repository contains a branch named rewrite-using-antlr4 where I started to write a Java code using ANTLR4 to do the translation from Fortran to Java. The main entry file is FortranHandlerPrototype.java.

The following steps are needed:

• implement methods in FortranListener.java that create an object-oriented AST
• implement methods to unparse that AST into Java (possibly including the Dummy class for handling GOTOs for now)
• run this on all BLAS methods
• use Maven plugin (what's its name again?) to do the bytecode replacements from Dummy.goto() and Dummy.label() into JVM GOTOs
• use above mechanics to also translate BLAS test suite