Update manpage based on current usage message
remove die definition and use in doc tests
libcore: Remove ptr::mut_addr_of since &mut is coerced to *mut
libcore: replace mut_addr_of properly on mac
auto merge of #4937 : luqmana/rust/remove-mut-addr-of, r=catamorphism
auto merge of #4940 : hansjorg/rust/manpage_06, r=catamorphism

Updated the rustc manpage based on the usage message for 0.6 (including -Z options). Also added an example showing how to compile with debug info.

This targets incoming rather than master. #4936 can be closed.
auto merge of #4941 : nickdesaulniers/rust/issue4524cleanup, r=catamorphism

review? @brson
Issue #4524