Add a test program for basic fenv.h rounding mode/exception mask testing.
Add new test program
Debug info for new test program
Stop useless disklabel warning if there are wedges, using GPT partition.
Fix PR kern/47989.

XXX: Pullup 6 and 7 (maybe 5)
add some A80 daudio and display regs
add A80 R_DAUDIO irq
add A80 debe, tcon, hdmi, daudio
add support for re-using a display mode setup by the bootloader
enable awindebe, genfb, wsdisplay