Auto merge of #57697 - dotdash:fast_lex_reg_resol_item_bodies, r=nagisa

Use a faster early exit during region expansion

Turns out that the equality check for regions is rather expensive, and
the current early exit check works in such a way, that the comparison is
even done twice. As we only really care about the case of equal scopes,
we can perform a faster, more specialized check and move it up one
level, so we can eventually skip the additional full comparison as well.

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