please add "-finstr-source" and "-fno-builtin" in the command line to enable generating source code

====================== FILEs added ==========================
A dump-sourcec.c
A gimple-pretty-print-c.c
A tree-pretty-print-c.c

===================== FILEs Modified =========================
=== searching "wang80" to find the modefied places ===========  
M gimple-pretty-print.c
M tree-pretty-print.c
M passes.c
M tree-pass.h
M Makefile.in
M common.opt
M opts.c
M cgraph.h 
