PR30657, gprof heap buffer overflow

PR30657, gprof heap buffer overflow

	PR 30657
	* cg_arcs.c (cg_assemble): Sanity check find_call addresses.
	* i386.c (i386_find_call): Don't access past end of core_text_space.
	* aarch64.c (aarch64_find_call): Round up lowpc, round down highpc.
	* alpha.c (alpha_find_call): Likewise.
	* mips.c (mips_find_call): Likewise.
	* sparc.c (sparc_find_call): Likewise.
	* vax.c (vax_find_call): Sanity check core_text_space accesses.