RFA: Fix calculation of size of builtin setjmp buffer

[Nicholas Clifton]

Hi Mike,

> How about GET_MODE_SIZE (STACK_SAVEAREA_MODE (SAVE_NONLOCAL)) / GET_MODE_SIZE (Pmode) + 2 + /* slop for mips, see builtin_setjmp_setup */ 1 - 1.  This retains the slop for mips, and fixes ports like ia64 and s390 (see STACK_SAVEAREA_MODE on those ports, it is larger one might expect)?


OK - revised patch attached.  I have added a comment before the 
computation to explain each of the numbers, and adjusted the comments in 
the other files to match the new size of the jump buffer.

What do you think of this version ?

Cheers
   Nick



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