This patch addresses a few issues related to 8.5.3 [dcl.init.ref]
It uses a recent API to find inherited conversion functions to do
the initializer to reference lvalue conversion (and removes a FIXME).
It issues the ambiguity diagnostics when multiple conversions are found.
WIP.

llvm-svn: 82649
diff --git a/clang/lib/Sema/Sema.h b/clang/lib/Sema/Sema.h
index 875da1a..771af4b 100644
--- a/clang/lib/Sema/Sema.h
+++ b/clang/lib/Sema/Sema.h
@@ -3469,6 +3469,11 @@
                                  bool AllowExplicit = false,
                                  bool Elidable = false);
   bool PerformImplicitConversion(Expr *&From, QualType ToType,
+                                 const char *Flavor,
+                                 bool AllowExplicit,
+                                 bool Elidable,
+                                 ImplicitConversionSequence& ICS);
+  bool PerformImplicitConversion(Expr *&From, QualType ToType,
                                  const ImplicitConversionSequence& ICS,
                                  const char *Flavor);
   bool PerformImplicitConversion(Expr *&From, QualType ToType,