Postfix completion: apply throw template on Throwable only

java/java-tests/testData/codeInsight/template/postfix/templates/throw/notThrowable.java

@@ -0,0 +1,5 @@
+public class Foo {
+    void m(Object o) {
+        o.throw<caret>
+    }
+}

java/java-tests/testData/codeInsight/template/postfix/templates/throw/notThrowable_after.java

@@ -0,0 +1,5 @@
+public class Foo {
+    void m(Object o) {
+        throw o;<caret>
+    }
+}

java/java-tests/testData/codeInsight/template/postfix/templates/throw/simple.java

@@ -1,5 +1,7 @@
+import java.lang.RuntimeException;
+
 public class Foo {
-    void m(Object o) {
-        o.throw<caret>
+    void m() {
+        new RuntimeException("error").throw<caret>
     }
 }

java/java-tests/testData/codeInsight/template/postfix/templates/throw/simple_after.java

@@ -1,5 +1,7 @@
+import java.lang.RuntimeException;
+
 public class Foo {
-    void m(Object o) {
-        throw o;<caret>
+    void m() {
+        throw new RuntimeException("error");
     }
 }