Revert rL362358 : PR42104: Support instantiations of lambdas that implicitly capture packs.

Two changes:
 * Track odr-use via FunctionParmPackExprs to properly handle dependent
   odr-uses of packs in generic lambdas.
 * Do not instantiate implicit captures; instead, regenerate them by
   instantiating the body of the lambda. This is necessary to
   distinguish between cases where only one element of a pack is
   captured and cases where the entire pack is captured.
........
Fixes http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win buildbot failures

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@362375 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 9 deletions

diff --git a/lib/Sema/SemaTemplateInstantiate.cpp b/lib/Sema/SemaTemplateInstantiate.cpp
index 973f564d30..ba54d5010b 100644
--- a/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/lib/Sema/SemaTemplateInstantiate.cpp
@@ -1368,11 +1368,9 @@ TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
     Vars.push_back(D);
   }
 
-  auto *PackExpr =
-      FunctionParmPackExpr::Create(getSema().Context, T, E->getParameterPack(),
-                                   E->getParameterPackLocation(), Vars);
-  getSema().MarkFunctionParmPackReferenced(PackExpr);
-  return PackExpr;
+  return FunctionParmPackExpr::Create(getSema().Context, T,
+                                      E->getParameterPack(),
+                                      E->getParameterPackLocation(), Vars);
 }
 
 ExprResult
@@ -1391,10 +1389,8 @@ TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
       QualType T = TransformType(E->getType());
       if (T.isNull())
         return ExprError();
-      auto *PackExpr = FunctionParmPackExpr::Create(getSema().Context, T, PD,
-                                                    E->getExprLoc(), *Pack);
-      getSema().MarkFunctionParmPackReferenced(PackExpr);
-      return PackExpr;
+      return FunctionParmPackExpr::Create(getSema().Context, T, PD,
+                                          E->getExprLoc(), *Pack);
     }
 
     TransformedDecl = (*Pack)[getSema().ArgumentPackSubstitutionIndex];