*: remove instances of go:linkname throughout

[jbowens]

With Go 1.23, the Go linker is much more restrictive about uses of go:linkname and will specifically disallow linking to internal standard library symbols (golang/go#67401). For now it seems we are safe to upgrade to Go 1.23 as they have surveyed major open-source repositories including cockroach to find instances of go:linkname and allow-listed already-linkname'd symbols. However, things are liable to change in the future and symbols may be removed from the allow-list.

See cockroachdb/cockroach#128922.

internal/fastrand/fastrand.go://go:linkname Uint32 runtime.fastrand
internal/fastrand/fastrand.go://go:linkname Uint32n runtime.fastrandn
internal/manual/manual.go://go:linkname throw runtime.throw
internal/rawalloc/rawalloc_go1.9.go://go:linkname mallocgc runtime.mallocgc
sstable/colblk/base.go://go:linkname memmove runtime.memmove
sstable/colblk/base.go://go:linkname mallocgc runtime.mallocgc

Jira issue: PEBBLE-241

[pkieltyka]

hi all, I noticed this was moved to backlog, but doesn’t this prevent use of go 1.23 with pebble?

[jbowens]

My understanding is that for the go 1.23 release, all existing open-source usages (like ours) are permitted.