Hans Wennborg e495eabd32 [clang] Include the error message in file reading error diagnostic ...

in order to provide as much information as possible to the user. The
diagnostic will now look like for example:

  error: error reading '/tmp/foo.c': Permission denied

(This addresses a FIXME from 2019, 9ef6c49baf)

Differential revision: https://reviews.llvm.org/D146280

2023-03-17 13:47:02 +01:00

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