Changed the handling of variadic intrinsics a bit. Removed the -fp80 option and made real be 80bit floats on X86, this is what the D spec really says it should be and fixes a bunch of issues. Changed the handling of parameter attributes to a bit more generalized approach. Added sext/zext attributes for byte/short/ubyte/ushort parameters, fixes #60 . Parameter attribs now properly set for intrinsic calls if necessary. Made the tango.math.Math patch less intrusive. Fixed/added some mini tests.

After making sure llvmdc and its runtime are up to date, use
./runtest tmp-sensible-name
to run tests for llvmdc.
Move into reference/ subfolder and add to svn if desired.

Use
./findregressions old-test-resultfile tmp-sensible-name
to find changes.

Recommended for comparing to DMD:
./findregressions reference/dmd-version llvmdc-something | grep -v "PASS -> XFAIL" | sort > tmp-new-regressions