Enhance struct Lisp_Subr to hold the alternative "BC_" function.
Also fix a GC bug, where symbols with position were not being disabled. * src/lisp.h (union Lisp_Function): New type. (struct Lisp_Subr): Add fields normal_function, BC_function, and next. (DEFUN): Setup all three function fields to the subr (BC_function is still a dummy), set field next to NULL. * src/alloc.c (Fgarbage_collect): Move the binding of Qsymbols_with_pos_enabled to garbage_collect_1 so that it gets bound when GC is invoked via garbage_collect. * src/lread.c (subr_ptr, using_BC_subrs): New static variables. (Fswitch_to_BC_subrs, Fswitch_to_normal_subrs): New defuns. (defsubr): Chain new subr to previous using field next and variable subr_ptr. (init_lread): Initialise subr_ptr to NULL. (syms_of_lread): Create subrs Sswitch_to_BC_subrs and Sswitch_to_normal_subrs. * src/pdumper.c (dump_subr): Enhance to dump struct Lisp_Subr's new fields. Update the expected value of HASH_Lisp_Subr_xxxxxxxxxx. (dump_vectorlike): Also dump PVEC_SYMBOL_WITH_POSes.
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