Directly restart processing calling functions.

test/libsolidity/syntaxTests/controlFlow/unreachableCode/library_function_import_bug.sol

@@ -0,0 +1,18 @@
+==== Source: a ====
+import "b";
+contract Test is Bar {}
+==== Source: b ====
+library Foo {
+    function nop() internal {}
+}
+
+contract Bar {
+    function example() public returns (uint256) {
+        foo();
+        return 0;
+    }
+
+    function foo() public {
+        Foo.nop();
+    }
+}

test/libsolidity/syntaxTests/controlFlow/unreachableCode/library_function_nonimport_bug.sol

@@ -0,0 +1,16 @@
+contract Bar {
+    function example() public {
+        foo();
+        return;
+    }
+
+    function foo() internal {
+        Foo.nop();
+    }
+}
+
+contract Y is Bar {}
+
+library Foo {
+    function nop() internal {}
+}