[llvm] [vim] Improve iskeyword for LLVM IR (PR #117905)

[Nick Desaulniers via llvm-commits]

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@@ -11,3 +11,4 @@ setlocal softtabstop=2 shiftwidth=2
 setlocal expandtab
 setlocal comments+=:;
 setlocal commentstring=;\ %s
+setlocal iskeyword=%, at -@,$,a-z,A-Z,48-57,_,.,-
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nickdesaulniers wrote:

Is `48-57` really how one encodes `0-9`? If so, ew!

https://github.com/llvm/llvm-project/pull/117905