working on reading class data from .class files

compiler/testData/readClass/Class.kt

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+namespace test
+
+class Ramification

compiler/testData/readClass/ClassFun.kt

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+namespace test
+
+class River {
+    fun song() = 1
+}

compiler/testData/readClass/FunParamNotNull.kt

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+namespace test
+
+fun fff(a: String) = 1

compiler/testData/readClass/FunParamNullable.kt

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+namespace test
+
+fun fff(a: String?) = 1

compiler/testData/readClass/NsFun.kt

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+namespace test
+
+fun f() = 1