Implement Mario's suggestions:
- Clean up code replace merge algorithm with a function.
- Fix for_statement setting control variable to not a constant.
- Fix for_statement checking BY expression to get correct value for optimization
branch.

Thanks Mario.

include ../../common.mk

lib_LIBRARIES = libstage4_c.a

libstage4_c_a_SOURCES = generate_c.cc 

libstage4_c_a_LIBADD = ../stage4.o

libstage4_c_a_CPPFLAGS = -I../../../absyntax