[llvm] Add empty top level .clang-format-ignore (PR #136022)

[Arthur Eubanks via llvm-commits]

https://github.com/aeubanks created https://github.com/llvm/llvm-project/pull/136022

Otherwise if the source tree is embedded in another project with a .clang-format-ignore, some clang-format tests fail because they use that .clang-format-ignore.

>From 9c30137e7f912780aeb67e95216576d4969bc293 Mon Sep 17 00:00:00 2001
From: Arthur Eubanks <aeubanks at google.com>
Date: Wed, 16 Apr 2025 20:30:04 +0000
Subject: [PATCH] Add empty top level .clang-format-ignore

Otherwise if the source tree is embedded in another project with a .clang-format-ignore, some clang-format tests fail because they use that .clang-format-ignore.
---
 .clang-format-ignore | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 .clang-format-ignore

diff --git a/.clang-format-ignore b/.clang-format-ignore
new file mode 100644
index 0000000000000..e69de29bb2d1d