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* Introduce symbol environments (type Senv.t) as a restricted view on global ↵Xavier Leroy2014-11-261-3/+3
| | | | environments (type Genv.t). Use symbol environments instead of global environments for external functions (module Events).
* Verification of the Unusedglob pass (removal of unreferenced static global ↵Xavier Leroy2014-11-241-0/+1256
definitions). Assorted changes to ia32/Op.v. PowerPC and ARM need updating.