[PATCH] cmake: Error on invalid CMAKE_BUILD_TYPE

[Justin Bogner via llvm-commits]

Apparently if you make a typo in the argument to CMAKE_BUILD_TYPE, cmake
silently accepts this but doesn't apply any particular build type to
your build. For LLVM, this means you get a build that doesn't really
make any sense - it's sort of a debug build with asserts disabled.

I'm not really sure why cmake allows this at all and the attached patch
is basically a horrible hack to avoid the issue, but I just spent an
obscene amount of time debugging some bizarre behaviour I ran into
because I set the build type to RelWithDebugInfo instead of
RelWithDebInfo.

Better suggestions welcome.

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