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

[Paul Kirth via llvm-commits]

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@@ -1,4 +1,5 @@
 # FIXME: Disabled on Windows for now because Windows has no ulimit command.
+REQUIRES: shell
 UNSUPPORTED: target={{.*windows.*}}
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ilovepi wrote:

Maybe the fixme should stay(or be updated), since we could remove REQUIRES: shell, without the use of ulimit? WDYT?

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