[gcc/devel/ranger] c++: Add test for PR 86327.

[Aldy Hernandez]

https://gcc.gnu.org/g:4ded16a7782fd3a9e7b37291d04bca596b00b8bd

commit 4ded16a7782fd3a9e7b37291d04bca596b00b8bd
Author: Marek Polacek <polacek@redhat.com>
Date:   Sat Apr 11 10:45:33 2020 -0400

    c++: Add test for PR 86327.
    
    Fixed by r264171.
    
            PR c++/86327
            * g++.dg/cpp1y/constexpr-return5.C: New test.

Diff:
---
 gcc/testsuite/ChangeLog                        |  5 +++++
 gcc/testsuite/g++.dg/cpp1y/constexpr-return5.C | 12 ++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index fa09a7d2877..460e6bd43d8 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-04-11  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86327
+	* g++.dg/cpp1y/constexpr-return5.C: New test.
+
 2020-04-11  Uroš Bizjak  <ubizjak@gmail.com>
 
 	PR target/94494
diff --git a/gcc/testsuite/g++.dg/cpp1y/constexpr-return5.C b/gcc/testsuite/g++.dg/cpp1y/constexpr-return5.C
new file mode 100644
index 00000000000..e8de5ed671e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/constexpr-return5.C
@@ -0,0 +1,12 @@
+// PR c++/86327
+// { dg-do compile { target c++14 } }
+
+int global = 0;
+
+constexpr int
+f (bool arg)
+{
+  if (arg)
+    return 1;
+  return global++;
+}