Explicitly handle new CK_AddressSpaceConversion cast kind to get rid of warning.
Address space conversion casts can only happen between pointers, so no need for full type info, and thereby no need for IWYU analysis.

git-svn-id: http://include-what-you-use.googlecode.com/svn/trunk@503 812d1f90-f944-d88a-411a-122bdc93e1ea
Disable bogus warning in MSVC about destructors never returning.
This spews noise for LLVM/Clang constructs as well as IWYU's FatalMessageEmitter,
which calls abort in its destructor.

git-svn-id: http://include-what-you-use.googlecode.com/svn/trunk@504 812d1f90-f944-d88a-411a-122bdc93e1ea