[libc] [llvm] [libc] add remaining epoll functions, pipe (PR #84587)

[Nick Desaulniers via llvm-commits]

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@@ -548,6 +548,11 @@ def POSIX : StandardSpec<"POSIX"> {
           RetValSpec<OffTType>,
           [ArgSpec<IntType>, ArgSpec<OffTType>, ArgSpec<IntType>]
         >,
+        FunctionSpec<
+          "pipe",
+          RetValSpec<IntType>,
+          [ArgSpec<IntPtr>] //TODO: make this int[2]
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nickdesaulniers wrote:

Do we not already have support for array params?

https://github.com/llvm/llvm-project/pull/84587