[PATCH] i386: let signal handlers set the resume flag

Allow signal handlers to set the RF bit in EFLAGS.  This lets a simple
debugger using SIGTRAP skip one instruction after returning from a signal.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>