Unfortunately iwyu gets quite confused by the weird cyclic dependencies
between various foo.h/foo.hxx and cppumaker generated headers, so it's
not obvious if any improvement here is realistic...
Change-Id: I0bc66f98b146712e28cabc18d56c11c08418c721
...to improve diagnosing misuses of boolean expressions in client code (cf.
compilerplugins/clang/implicitboolconversion.cxx). This change should be
transparent to client code.
Change-Id: I4c9a55f8c7d0f05fda617f9b33d93ce78bb8fbeb
