[clang] [clang] Warn on umask() argument bits outside 0777 (PR #198130)

[Aaron Ballman via cfe-commits]

================
@@ -3800,6 +3800,14 @@ def VFork : LibBuiltin<"unistd.h"> {
   let Prototype = "pid_t()";
 }
 
+// POSIX sys/stat.h
+
+def Umask : LibBuiltin<"sys/stat.h"> {
+  let Spellings = ["umask"];
+  let Attributes = [IgnoreSignature];
----------------
AaronBallman wrote:

```suggestion
  let Attributes = [IgnoreSignature, NoThrow];
```

https://github.com/llvm/llvm-project/pull/198130
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