There exists some description of the flag from Microsoft, but not sure if
there's more to it. We ignore the flag for now until we find out more about it.
https://docs.microsoft.com/en-us/cpp/build/reference/kernel-create-kernel-mode-binary?view=msvc-170
Reviewed By: thieta, hans
Differential Revision: https://reviews.llvm.org/D128238
def throwingnew : F<"throwingnew">;
def editandcontinue : F<"editandcontinue">;
def fastfail : F<"fastfail">;
+def kernel : F<"kernel">;
def pdbcompress : F<"pdbcompress">;
def delay : P_priv<"delay">;