[PATCH] support $$vars and $$parms

[Stan Cox]

Given: 
probe kernel.statement("bio_map_kern@fs/bio.c:850") {print ($$vars) }
Results:
q=0xffffffffdea58ca8 data=0xffffffffdf5c6d88 gfp_mask=0x10
bio=0xd5362c00 

$$vars expands to sprintf("%#x %#x %#x %#x\n", parm1, parm2, var1, var2)
$$parms expands to sprintf("%#x %#x\n", parm1, parm2)
where parm are the function parameters and var are local variables live
at that location.

Testing and documentation are in progress.




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