MIPS SB-1 DFA scheduler patch

[Jim Wilson]

Here is round 2.  Mostly this contains changes as discussed with you. 
The only significant new change is that I rewrote the support for the
-msb1-fp-exceptions option, which is now -mfp-exceptions, and
implemented via TARGET_SWITCHES instead of TARGET_OPTIONS.  This caused
a bunch of cascading changes.

This was tested by building a combined binutils/gcc/newlib/etc tree,
configured for C and C++, and running make check.  I also hand verified
some of the changes, such as the new sb1_fp_pipes attribute.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
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