Fixed a bad assert from r194968. r194969 removed the assert.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196463 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Tooling/CompilationDatabase.cpp

@@ -271,6 +271,7 @@ bool stripPositionalArgs(std::vector<const char *> Args,
   End = std::remove_if(Args.begin(), End, MatchesAny(DiagClient.UnusedInputs));
 
   // Remove the -c add above as well. It will be at the end right now.
+  assert(strcmp(*(End - 1), "-c") == 0);
   --End;
 
   Result = std::vector<std::string>(Args.begin() + 1, End);