PR gdb/13987:

	PR gdb/13987:
	* jit.c (struct jit_inferior_data) <cached_code_address,
	jit_breakpoint>: New fields.
	(jit_breakpoint_re_set_internal): Fix logging.  Only create
	breakpoint if cached address has changed.
	(jit_update_inferior_cache, jit_breakpoint_deleted): New
	functions.
	(_initialize_jit): Register breakpoint deleted observer.
gdb/testsuite
	* gdb.base/jit.exp (compile_jit_test): New proc.
	Add PIE tests.