Forward the -fno-elide-constructor argument to clang -cc1. Fixes PR8652.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 20977f2..fafe1d2 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -1347,6 +1347,12 @@
                    false))
     CmdArgs.push_back("-fno-access-control");
 
+  // -felide-constructors is the default.
+  if (Args.hasFlag(options::OPT_fno_elide_constructors,
+                   options::OPT_felide_constructors,
+                   false))
+    CmdArgs.push_back("-fno-elide-constructors");
+
   // -fexceptions=0 is default.
   if (!KernelOrKext &&
       needsExceptions(Args, InputType, getToolChain().getTriple()))