[PATCH] [CMake] Finish off the clang-cl self host build

[Reid Kleckner]

lgtm

woot!`


================
Comment at: cmake/modules/AddLLVM.cmake:25
@@ -24,1 +24,3 @@
     endif()
+    if (CLANG_CL)
+      list(APPEND LLVM_COMPILE_DEFINITIONS "GTEST_HAS_SEH=0")
----------------
Can you put something like `# FIXME: Remove this when LLVM's SEH support is finished.`?

http://reviews.llvm.org/D7875

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