java-decompiler: extra casts on method calls omitted

(loosely based on https://github.com/JetBrains/intellij-community/pull/217)

testData/src/pkg/TestAmbiguousCall.java

@@ -0,0 +1,16 @@
+package pkg;
+
+class TestAmbiguousCall {
+  void m1(RuntimeException e, String s) { }
+  void m1(IllegalArgumentException e, String s) { }
+
+  void test() {
+    IllegalArgumentException iae = new IllegalArgumentException();
+    m1((RuntimeException)iae, "RE");
+    m1(iae, "IAE");
+
+    RuntimeException re = new IllegalArgumentException();
+    m1(re, "RE");
+    m1((IllegalArgumentException)re, "IAE");
+  }
+}