* config/s390/s390.md (s390_warn_framesize_string)
(s390_warn_dynamic_string, s390_stack_size_string)
(s390_stack_guard_string): New global string variables.
(s390_warn_framesize, s390_warn_dynamicstack_p, s390_stack_size)
(s390_stack_guard): New global variables.
(override_options): Added checks for the new options.
(s390_emit_prologue): Emit stack check and trap code and perform
compile time stack size checking.
* config/s390/s390.h (TARGET_OPTIONS): Added new options
"warn-framesize", "warn-dynamicstack", "stack-size" and
"stack-guard".
* doc/invoke.texi: Added documentation for the new options.
From-SVN: r86284
