testcases for undefined and unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17058 91177308-0d34-0410-b5e6-96231b3b80d8

test/Feature/undefined.ll

@@ -0,0 +1,15 @@
+
+%X = global int undef
+
+implementation
+
+declare int "atoi"(sbyte *)
+
+int %test() {
+	ret int undef
+}
+
+int %test2() {
+	%X = add int undef, 1
+	ret int %X
+}

test/Feature/unreachable.ll

@@ -0,0 +1,13 @@
+
+implementation
+
+declare void %bar()
+
+int %foo() {  ;; Calling this function has undefined behavior
+	unreachable
+}
+
+double %xyz() {
+	call void %bar()
+	unreachable          ;; Bar must not return.
+}