get_current for Alpha LKCD

[Brian Hall <brianwhall@xxxxxxxxxx>]

The 2.3 Alpha lkcd compiled but didn't link, since get_current() wasn't defined
for Alpha. Here is the definition I used for my 2.2 version, add it to the end
of /usr/src/linux-2.3.99pre9/include/asm-alpha/vmdump.h:

#define get_current()                                           \
({                                                              \
        register unsigned long sp;                              \
        asm("bis $30,$30,%0" : "=r" (sp));                      \
        sp;                                                     \
})          

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