Map intrinsic companion objects in JavaToKotlinClassMap

Get rid of multiple usages of IntrinsicObjects where JavaToKotlinClassMap was
already used, simplify code, and support loading of *CompanionObject as Kotlin
built-in companions from Java code.

Also fix a small bug where Boolean was considered a class with an intrinsic
companion in IntrinsicObjects, although it was not

compiler/testData/loadJava/compiledJava/IntrinsicCompanionObject.java

@@ -0,0 +1,10 @@
+package test;
+
+import kotlin.jvm.internal.*;
+
+public interface IntrinsicCompanionObject {
+    void testInt(IntCompanionObject i);
+    void testChar(CharCompanionObject c);
+    void testString(StringCompanionObject s);
+    void testEnum(EnumCompanionObject e);
+}

compiler/testData/loadJava/compiledJava/IntrinsicCompanionObject.txt

@@ -0,0 +1,8 @@
+package test
+
+public trait IntrinsicCompanionObject {
+    public abstract fun testChar(/*0*/ p0: kotlin.Char.Companion!): kotlin.Unit
+    public abstract fun testEnum(/*0*/ p0: kotlin.Enum.Companion!): kotlin.Unit
+    public abstract fun testInt(/*0*/ p0: kotlin.Int.Companion!): kotlin.Unit
+    public abstract fun testString(/*0*/ p0: kotlin.String.Companion!): kotlin.Unit
+}