Blind attempt to fix linker errors when building libc++abit w/o exceptions.

llvm-svn: 344156

libcxxabi/src/cxa_noexception.cpp

@@ -52,4 +52,9 @@ __cxa_uncaught_exceptions() throw() { return 0; }
 
 }  // extern "C"
 
+// provide dummy implementations for the 'no exceptions' case.
+uint64_t __getExceptionClass  (const _Unwind_Exception*)           { return 0; }
+void     __setExceptionClass  (      _Unwind_Exception*, uint64_t) {}
+bool     __isOurExceptionClass(const _Unwind_Exception*)           { return false; }
+
 }  // abi