Switch assert(0/false) llvm_unreachable.

llvm-svn: 140367
diff --git a/clang/tools/libclang/CIndexer.cpp b/clang/tools/libclang/CIndexer.cpp
index 56974b9..995a8fe 100644
--- a/clang/tools/libclang/CIndexer.cpp
+++ b/clang/tools/libclang/CIndexer.cpp
@@ -74,7 +74,7 @@
   // This silly cast below avoids a C++ warning.
   Dl_info info;
   if (dladdr((void *)(uintptr_t)clang_createTranslationUnit, &info) == 0)
-    assert(0 && "Call to dladdr() failed");
+    llvm_unreachable("Call to dladdr() failed");
   
   llvm::sys::Path LibClangPath(info.dli_fname);