add more instructions to INSTR

[WalterBright]

So many instructions, I just add the ones needed.

[dlang-bot]

Thanks for your pull request, @WalterBright!

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#20784"

[WalterBright]

Oh it's annoying not being able to use the => syntax for function bodies because of the bootstrap compiler.