fix arm thumb mode return address #1056

Job	Run time
build_container	9m 4s
test_installer	52m 14s
build_and_check_fork	0s
sym_trace_tests (x86_64)	9s
make_check (check-qtest-x86_64)	1m 45s
make_check (check-qtest-i386)	1m 46s
make_check (check-qtest-arm)	1m 10s
make_check (check-qtest-mips)	34s
make_check (check-qtest-mipsel)	33s
make_check (check-qtest-ppc)	1m 14s
make_check (check-block)	1m 18s
make_check (check-unit)	1m 12s
make_check (check-qapi-schema)	9s
taint_tests (i386)	50m 15s
taint_tests (x86_64)	6m 43s
pypanda_tests (dyn_hooks)	10s
pypanda_tests (copy_test)	13s
pypanda_tests (file_fake)	9s
pypanda_tests (file_hook)	5s
pypanda_tests (generic_tests)	2m 11s
pypanda_tests (monitor_cmds)	9s
pypanda_tests (multi_proc_cbs)	16s
pypanda_tests (sleep_in_cb)	7s
pypanda_tests (syscalls)	6s
pypanda_tests (record_no_snap)	15s
pypanda_tests (sig_suppress)	1m 21s
cleanup	1s
	2h 13m 9s

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