A few more tests of flambdacheck
Start testing flambdagen
Add Flambdaiter.map and Flambda.iter_toplevel
Add Sort_connected_components and Flambda.recursive_functions
Test connected components
Add Flambdaexport

Types for cross module informations
Add constant analysis (Flambdaconstants)
type Compilation unit is Ident.t now
Change constants representation in clambda and propagates to cmmgen
Add export_info to cmx_format and Compilenv

Also add needed conversions functions in flambda
Fix 1: Remove closed field
Fix 1: correct identifier equality
Add Flambdasym

Attribute symbols to constants
Add Clambdagen

Convert flambda to clambda
Use previous changes in Asmgen
Makefile and .depend