GRExprEngine: Handle empty statement expressions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64541 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/misc-ps.m b/test/Analysis/misc-ps.m
index 4e7f0ad..0ddce3a 100644
--- a/test/Analysis/misc-ps.m
+++ b/test/Analysis/misc-ps.m
@@ -108,3 +108,9 @@
   pr3422_helper(&q[1]);
 }
 
+// PR 3543 (handle empty statement expressions)
+int pr_3543(void) {
+  ({});
+}
+
+