Prepare for Go 1.18 by replacing all our forked code #549
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This hides our forked-from-gotip code behind a build tag so it's only
used when the build is run on Go <1.18. For builds >= 1.18, we'll use
the actual runtime/debug and debug/buildinfo packages.
Add preliminary support for building on Go 1.18beta1 to our Build
matrix, to ensure this code builds. It's all a terrible hack, but it'll
get less so when 1.18 is actually released.
(If we'd rather wait until 1.18 is actually released that's fine by me, this can wait.)