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e7aed23d32
Functions with `musttail` calls can't be roots because we can't instrument their `ret` to release the context. This patch tags their `CtxRoot` field in their `FunctionData`. In compiler-rt we then know not to allow such functions become roots, and also not confuse `CtxRoot == 0x1` with there being a context root. Currently we also lose the context tree under such cases. We can, in a subsequent patch, have the root detector search past these functions.