Change -code-completion-debug-printer to -no-code-completion-debug-printer.

Also, tweak a few help strings and update CompilerInvocation serialization for prev change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89317 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/CIndex/CIndex.cpp b/tools/CIndex/CIndex.cpp
index ebdba29..46732de 100644
--- a/tools/CIndex/CIndex.cpp
+++ b/tools/CIndex/CIndex.cpp
@@ -1219,7 +1219,7 @@
   argv.push_back("-Xclang");
   argv.push_back(code_complete_at.c_str());
   argv.push_back("-Xclang");
-  argv.push_back("-code-completion-debug-printer=0");
+  argv.push_back("-no-code-completion-debug-printer");
   
   // Add the source file name (FIXME: later, we'll want to build temporary
   // file from the buffer, or just feed the source text via standard input).