[compiler-rt] [llvm-lit] Add REQUIRES: shell in compiler-rt tests that use the `ulimit` command in lit internal shell (PR #105339)

[Florian Mayer via llvm-commits]

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@@ -1,3 +1,4 @@
+// REQUIRES: shell
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fmayer wrote:

nit: i would prefer if the comment stayed in the first line

https://github.com/llvm/llvm-project/pull/105339