Make it possible to specify flags for pseudo instructions defined in bytecodes.c

[iritkatriel]

The instruction metadata is incorrect for some of the pseudo instructions. For instance, these map to NOP, and take their metadata from it, but they should have the HAS_ARG flag set.

  [SETUP_FINALLY] = { true, 0, 0 },
  [SETUP_CLEANUP] = { true, 0, 0 },
  [SETUP_WITH] = { true, 0, 0 },

We need to be able to specify flags for pseudo instructions in bytecodes.c (and relax assertions that it is identical to the target flags).

Linked PRs

• gh-112519: Make it possible to specify instruction flags for pseudo instructions in bytecodes.c #112520