add test for EH interaction

Author: tlively

test/spec/return_call_eh.wast

@@ -0,0 +1,35 @@
+;; Test the combination of 'return_call' with exception handling
+
+(module
+  (tag $t)
+
+  (func $test (export "test") (result i32)
+    (try (result i32)
+      (do
+        (call $return-call-in-try)
+      )
+      (catch_all
+        ;; Catch the exception thrown from $return-callee
+        (i32.const 42)
+      )
+    )
+
+  )
+
+  (func $return-call-in-try (result i32)
+    (try (result i32)
+      (do
+        (return_call $return-callee)
+      )
+      (catch_all
+        (unreachable)
+      )
+    )
+  )
+
+  (func $return-callee (result i32)
+   (throw $t)
+  )
+)
+
+(assert_return (invoke "test") (i32.const 42))