Change object marking routines to minimize stack usage.
This change moves a few cold paths from mark_object to NO_INLINE functions and adjusts symbol marking loop. According to GCC 4.8.2 -Wstack-usage, this reduces mark_object's stack usage from 80 to 48 bytes on a 64-bit system. For a long byte-force-recompile runs, stack usage at the mark phase is reduced up to 28%. Surprisingly, it also gains up to 3% in speed (with default '-O2 -g3' flags). * alloc.c (mark_compiled, mark_localized_symbol): New functions, refactored out from ... (mark_object): ... adjusted user. Also mark symbols in a tight inner loop. (mark_face_cache): Add NO_INLINE.
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