Silence two C4806 warnings ('|': unsafe operation: no value of type 'bool'...

Silence two C4806 warnings ('|': unsafe operation: no value of type 'bool' promoted to type 'const unsigned int' can equal the given constant). The fact that they trigger with this code seems like it may be a bug, but the warning itself is still generally useful enough to retain it for now.

llvm-svn: 267337