Add variants of the dispatchsetup pseudo for Thumb and !VFP. <rdar://10620138>

My change r146949 added register clobbers to the eh_sjlj_dispatchsetup pseudo
instruction, but on Thumb1 some of those registers cannot be used.  This
caused massive failures on the testsuite when compiling for Thumb1.  While
fixing that, I noticed that the eh_sjlj_setjmp instruction has a "nofp"
variant, and I realized that dispatchsetup needs the same thing, so I have
added that as well.

llvm-svn: 147204