Added for go1.20

• fixedbugs/issue25897a.go
• fixedbugs/issue54343.go

Removed because these are skipped:

• fixedbugs/issue10607.go: // +build linux,!ppc64,gc
• fixedbugs/issue13268.go: // +build gc
• fixedbugs/issue14636.go: // +build !nacl,!js,!android,gc
• fixedbugs/issue22660.go: // +build !js,gc
• fixedbugs/issue22662b.go: // +build !js,gc
• typeparam/issue51733.go: moved to fixedbugs/issue51733.go and //go:build cgo

Removed because it no longer exists:

• fixedbugs/issue4388.go

Removed because commented out for a while:

• fixedbugs/bug248.go: skipped // +build !nacl,!js,!plan9
• fixedbugs/bug302.go: no longer exists
• fixedbugs/bug345.go- fixedbugs/bug369.go: skipped // +build !nacl,!js,gc
• fixedbugs/bug429_run.go: no longer exists
• fixedbugs/issue9862_run.go: skipped // +build !nacl,!js,gc

There are probably more known failures that will have to be added for go1.20, I'm still working on getting through all the tests. This is part of #1270