Qiongsi Wu f7aa1cdc9b
[clang] Canonicalizing -include-pch input in the Frontend (#180065)
This patch adds logic to canonicalize `-include-pch`'s input in the
frontend. This way, the `ASTWriter` always serializes the canonicalized
path to the included pch file whether the input is an absolute path or a
relative path.

Fixes rdar://168596546.
2026-02-06 14:41:45 -08:00
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