Move HeaderSearchOptions into the Lex library, make it intrusively
reference-counted, and hold a reference to it in HeaderSearch.

llvm-svn: 166583
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index aad63b6..b941609 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -36,13 +36,15 @@
 
 CompilerInvocationBase::CompilerInvocationBase()
   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
-    DiagnosticOpts(new DiagnosticOptions()) {}
+    DiagnosticOpts(new DiagnosticOptions()),
+    HeaderSearchOpts(new HeaderSearchOptions()) {}
 
 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
   : RefCountedBase<CompilerInvocation>(),
     LangOpts(new LangOptions(*X.getLangOpts())), 
     TargetOpts(new TargetOptions(X.getTargetOpts())),
-    DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())) {}
+    DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
+    HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())) {}
 
 //===----------------------------------------------------------------------===//
 // Utility functions.