[clang] Add option to format a whole file using git-clang-format (PR #204336)

[Björn Schäpers via cfe-commits]

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@@ -456,11 +461,23 @@ def extract_lines(patch_file):
     zero lines of context.  The return value is a dict mapping filename to a
     list of line `Range`s."""
     matches = {}
+
+    if whole_file:
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HazardyKnusperkeks wrote:

But is this just a different issue, or why does it only need to be done when using the whole file? I'm fairly certain I ran `git clang-format` from subdirectories.

https://github.com/llvm/llvm-project/pull/204336