gh-118771: Ensure names defined in optimizer.h start with Py/_Py

[encukou]

optimizer.h is included from Python.h, and defines some names that can clash with user code. They should be hidden or get the Py/_Py prefix.

This PR:

• removes unused struct tags from typedefs:
  • struct _bloom_filter
  • struct _exit_data
• prefixes the remaining names with _Py_:
  • uop_get_target
  • uop_get_exit_index
  • uop_get_jump_target
  • uop_get_error_target
  • optimize_func typedef
  • BLOOM_FILTER_WORDS
  • UOP_FORMAT_TARGET
  • UOP_FORMAT_EXIT
  • UOP_FORMAT_JUMP
  • UOP_FORMAT_UNUSED

Perhaps some of these should be in a private header instead?
Or perhaps some should be public?
@markshannon, could you clarify the intent here?

• Issue: 3.13 adds C macros/functions/types without the Py/_Py prefix #118771

[gvanrossum]

I'll leave this for @markshannon to review.

[brandtbucher]

I personally don't think we should be exposing this much of the micro-op format. Can they just be moved to pycore_optimizer.h? I forget if the same naming rules apply there.

[markshannon]

Yes, let's move as much as we can to pycore_optimizer.h

[markshannon]

@encukou Thanks for tidying that up