swift234

Add more options to dump the SIL during optimizations.

-sil-print-before=<string>     Print out the sil before passes which contain this string in their names
-sil-print-after=<string>      Print out the sil after passes which contain this string in their names
-sil-print-around=<string>     Print out the sil before and after passes which contain this string in their names

Output can further be restricted to a single function with the existing option
-sil-print-only-function=<function>




Swift SVN r23737