gh-158380: Fix the stack operand used by JIT dict access guards

[cocolato]

The probable type branches of _GUARD_NOS_DICT_SUBSCRIPT and _GUARD_NOS_DICT_STORE_SUBSCRIPT now check the dict at NOS:

Stack (top on the right):
  Read:  ... mapping, key
  Write: ... value, mapping, key

Before: _GUARD_TYPE     checks type(key)     == expected_type
After:  _GUARD_NOS_TYPE checks type(mapping) == expected_type

Reuse the existing NOS guard by renaming _GUARD_TYPE_ITER to _GUARD_NOS_TYPE, update its iterator call site, and regenerate the affected files fix this issue. Known-type paths still omit the guard.

• Issue: JIT dict access guards check the wrong stack operand #158380

[markshannon]

Looks good, thanks.

[miss-islington-app]

Thanks @cocolato for the PR, and @markshannon for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @cocolato and @markshannon, I could not cleanly backport this to 3.15 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker b98c065756ea336707c30885831e4afcb85aac84 3.15

[bedevere-app]

GH-158545 is a backport of this pull request to the 3.15 branch.