Separate the unescape functions but avoid duplicating code#138163

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hkBst wants to merge 2 commits intorust-lang:masterfrom hkBst:cleanup_lexer_unescape_macros

Commits on Mar 21, 2025

Separate the unescape functions for string, byte string and C string, but avoid duplicating code via macro_rules.
hkBst
committed
Replace all uses of unescape_unicode: no more unreachable!
hkBst
committed