[PATCH] Indicate success for simple options when clang called with -cc1

[David Wiberg]

Hello,

Running the following line:
    clang -cc1 [-help | -version | -analyzer-checker-help]
will cause clang to exit with return code != 0.

The attached patch changes this behavior to return 0. No test case has
been created. If this is wanted I will need input on where it should
be created.

Using Visual Studio I have run the "clang-test" project. Is there
anything else I'm supposed to do in preparation when sending a patch?

/ David
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