arrays in signatures: more tests, fix bugs

compiler/testData/writeSignature/ArrayOfCharSequence.kt

@@ -0,0 +1,6 @@
+fun never(): Array<java.lang.CharSequence> = throw Exception()
+
+// method: namespace::never
+// jvm signature:     ()[Ljava/lang/CharSequence;
+// generic signature: null
+// kotlin signature:  ()[Ljava/lang/CharSequence; // TODO: need to skip kotlin signature

compiler/testData/writeSignature/ArrayOfInt.kt

@@ -0,0 +1,6 @@
+fun never(): Array<Int> = throw Exception()
+
+// method: namespace::never
+// jvm signature:     ()[Ljava/lang/Integer;
+// generic signature: null
+// kotlin signature:  ()[Ljava/lang/Integer; // TODO: need to skip kotlin signature

compiler/testData/writeSignature/IntArray.kt

@@ -0,0 +1,6 @@
+fun never(): IntArray = throw Exception()
+
+// method: namespace::never
+// jvm signature:     ()[I
+// generic signature: null
+// kotlin signature:  ()[I // TODO: need to skip kotlin signature