[llvm] [Support] Add IWYU pragma for ManagedStatic.h (PR #117003)

[kadir çetinkaya via llvm-commits]

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@@ -8,7 +8,7 @@
 
 #include "llvm/Support/Parallel.h"
 #include "llvm/Config/llvm-config.h"
-#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/ManagedStatic.h" // IWYU pragma: keep
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kadircet wrote:

consider putting this behind `#ifdef _WIN32` if it's only needed on windows, instead of adding a keep pragma

https://github.com/llvm/llvm-project/pull/117003