[Toybox] ASAN errors in toysh

[Eric Roshan-Eisner]

I ran the shell through the afl++ fuzzer, and it split out a few different
ASAN failures for simple inputs:

heap-buffer-overflow:
$ toybox sh -c '$'
$ toybox sh -c '+()'
$ toybox sh -c '<<0;0'
$ toybox sh -c '{$,}'
floating-point-exception:
$ toybox sh -c '((0%0))'

Also found some ASAN failures on the vi command.

heap-buffer-overflow:
$ echo p > input; toybox vi -s input ascii.txt
stack-buffer-overflow:
$ echo s000000000000000 > input; toybox vi -s input ascii.txt


-Eric
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