[PATCH] Allow client use of -Wimplicit-fallthrough and fix a potential fallthrough bug

[Luke Zarko]

I'm building a Clang tool and would like to compile it with
-Wimplicit-fallthrough turned on. However, include/clang/Sema/Sema.h
contains an unannotated implicit fallthrough. Since there doesn't seem
to be a generally-agreed-upon standard annotation for this yet and
because I would prefer to avoid wrapping the include with pragmas to
turn the warning off, I suggest changing the code slightly to avoid
the problem.

I attempted to build the rest of Clang with the warning turned on.
Most of the uncommented fallthroughs look benign, save for one in
lib/Driver/ToolChains.cpp; I don't think aarch64 should fall through
to check for mips libraries if aarch64 isn't available.
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