7123954: Some CTW test crash with SIGSEGV
Summary: Correct Allocate expansion code to preserve i_o when only slow call is generated.
Reviewed-by: iveresov
7110832: ctw/.../org_apache_avalon_composition_util_StringHelper crashes the VM
Summary: Distance is too large for one short branch in string_indexofC8().
Reviewed-by: iveresov