Re: [C++ PATCH] overloaded operator fns [6/N]

This patch shrinks the lang_fn_decl's operator_code field from 16 to 6 bits, by storing the compressed operator code instead of the tree_code. I rename DECL_OVERLOADED_OPERATOR_CODE to DECL_OVERLOADED_OPERATOR_CODE_RAW, to remind that it's not a tree_code. DECL_OVERLOADED_OPERATOR_CODE_IS rema

[C++ PATCH] overloaded operator fns [6/N]

This patch adds a new enum for the overloaded operators, we only enumerate the codes we need, and thus can shrink the ovl_op_info array. We do need to create a mapping array to go from tree_code to ovl_op_code. More significantly is the use of the base.u.bits.address_space field, which is othe