* gdbarch.sh (BREAKPOINT_FROM_PC): Return a const buffer.

* gdbarch.sh (BREAKPOINT_FROM_PC): Return a const buffer.
* gdbarch.h, gdbarch.c: Regenerate.

* defs.h (breakpoint_from_pc_fn): Delete type definition.
* target.h (memory_breakpoint_from_pc): Update declaration.
* config/mcore/tm-mcore.h (mcore_breakpoint_from_p): Ditto.

* arch-utils.c (legacy_breakpoint_from_pc): Update return type.
* mcore-tdep.c (mcore_breakpoint_from_pc): Ditto.
* mem-break.c (memory_breakpoint_from_pc): Ditto.
* rs6000-tdep.c (rs6000_breakpoint_from_pc): Ditto.
* s390-tdep.c (s390_breakpoint_from_pc): Ditto
* xstormy16-tdep.c (xstormy16_breakpoint_from_pc): Ditto.
* mn10300-tdep.c (mn10300_breakpoint_from_pc): Ditto.
* mips-tdep.c (mips_breakpoint_from_pc): Ditto.
* m68hc11-tdep.c (m68hc11_breakpoint_from_pc): Ditto.
* ia64-tdep.c (ia64_breakpoint_from_pc): Ditto.
* d10v-tdep.c (d10v_breakpoint_from_pc): Ditto.
* arch-utils.c (legacy_breakpoint_from_pc): Ditto..

* mem-break.c (default_memory_insert_breakpoint): Make `bp' a
const pointer.
* monitor.c (monitor_insert_breakpoint): Ditto.
* rs6000-tdep.c (rs6000_software_single_step): Ditto for `breakp'.

* config/mcore/tm-mcore.h: Update copyright.
* mem-break.c: Ditto.
* xstormy16-tdep.c: Ditto.