[Support] Add const to `FileError::getFileName`
authorBen Barham <ben_barham@apple.com>
Fri, 11 Mar 2022 22:37:06 +0000 (14:37 -0800)
committerBen Barham <ben_barham@apple.com>
Mon, 14 Mar 2022 18:45:29 +0000 (11:45 -0700)
commit3466b8e23d9c1e2604bf366e208cff887070a4ff
tree9f2bd00786377ad7341476f03f0e2b7470cf1ac1
parentcc63ae42d77200ed85dd0d57f1d5c5800a67683c
[Support] Add const to `FileError::getFileName`

`getFileName` returns a `StringRef`, there's no reason it shouldn't be
const.

Differential Revision: https://reviews.llvm.org/D121495
llvm/include/llvm/Support/Error.h