Nuke SetUpBuildDumpLog.

Also, it was the only reason that `argc` and `argv` were being passed
into createDiagnostics, so remove those parameters and clean up callers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172945 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 7d999b8..f8c6f690 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -2587,9 +2587,7 @@
 
   // Configure the diagnostics.
   IntrusiveRefCntPtr<DiagnosticsEngine>
-    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions,
-                                              num_command_line_args,
-                                              command_line_args));
+    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions));
 
   // Recover resources if we crash before exiting this function.
   llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,