Re-instate r123977/r123978, my updates of the reference-binding
implementation used by overload resolution to support rvalue
references. The original commits caused PR9026 and some
hard-to-reproduce self-host breakage.

The only (crucial!) difference between this commit and the previous
commits is that we now properly check the SuppressUserConversions flag
before attempting to perform a second user-defined conversion in
reference binding, breaking the infinite recursion chain of
user-defined conversions.

Rvalue references should be working a bit better now.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124121 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index ad08a11..2d2c3ea 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -2470,6 +2470,7 @@
   TemplateParameterList::iterator Param = Params->begin(),
                                ParamEnd = Params->end();
   unsigned ArgIdx = 0;
+  LocalInstantiationScope InstScope(*this, true);
   while (Param != ParamEnd) {
     if (ArgIdx > NumArgs && PartialTemplateArgs)
       break;