When creating an ASTUnit by parsing source code, set DisableFree to
false (not true), so that the CompilerInstance will actually free data
structures when it's done. This fixes a major leak with libclang's
in-process code completion.

llvm-svn: 111457
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 28cdc52..f689404 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1377,7 +1377,7 @@
   // Override the resources path.
   CI->getHeaderSearchOpts().ResourceDir = ResourceFilesPath;
 
-  CI->getFrontendOpts().DisableFree = true;
+  CI->getFrontendOpts().DisableFree = false;
   return LoadFromCompilerInvocation(CI.take(), Diags, OnlyLocalDecls,
                                     CaptureDiagnostics, PrecompilePreamble,
                                     CompleteTranslationUnit,