Finish making AST BumpPtrAllocation runtime configurable (based on -disable-free).

snaroff% time ../../Release-Asserts/bin/clang INPUTS/Cocoa_h.m
0.179u 0.051s 0:00.23 95.6%	0+0k 0+0io 0pf+0w
snaroff% time ../../Release-Asserts/bin/clang INPUTS/Cocoa_h.m -disable-free
0.169u 0.052s 0:00.22 95.4%	0+0k 0+0io 0pf+0w


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63153 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/ParseAST.cpp b/lib/Sema/ParseAST.cpp
index ff6de25..67af285 100644
--- a/lib/Sema/ParseAST.cpp
+++ b/lib/Sema/ParseAST.cpp
@@ -39,7 +39,8 @@
   ASTContext *Context = 
     new ASTContext(PP.getLangOptions(), PP.getSourceManager(),
                    PP.getTargetInfo(),
-                   PP.getIdentifierTable(), PP.getSelectorTable());
+                   PP.getIdentifierTable(), PP.getSelectorTable(),
+                   FreeMemory);
   TranslationUnit *TU = new TranslationUnit(*Context);
   Sema S(PP, *Context, *Consumer);
   Parser P(PP, S);