This adds the 24j50, 25j50, 26j50, 44j50, 45j50, and 46j50 processors.
I hope I got it right this time. The A/D and I2C need a close look. They're completely untested, I just got it to compile.
The patch is against svn rev 5458.
Patches for pic16 PIC18f4xj50 family support
Accepted a modified variant in SDCC 2.9.1, r5470.