Improve diagnostics on header/impl classes when scopes don't match

Try to report most of the errors on the actual members of the impl
class. In many cases, there's a 1:1 mapping of header to impl class
members, so the error "some members are not implemented" on the class
declaration itself is redundant. Exceptions include functions/properties
from supertypes (there may be no other place to report a signature
mismatch error in this case), functions/properties not marked with
'impl' (the checker is only run for declarations explicitly marked with
'impl') and default constructors (the checker is not run for them)

 #KT-18447 Fixed

compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/output.txt

@@ -5,18 +5,9 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/jvm.kt:1:12: error: 'impl' class 'Foo' has no corresponding 'header' declaration
-The following declaration is incompatible because some members are not implemented:
-    public final header class Foo
-No implementations are found for members listed below:
-
+compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/jvm.kt:2:10: error: 'impl' constructor of 'Foo' has no corresponding 'header' declaration
+The following declaration is incompatible because parameter types are different:
     public constructor Foo(s: String)
 
-    The following declaration is incompatible because parameter types are different:
-        public constructor Foo(s: Array<String>)
-
-impl class Foo {
-           ^
-compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/jvm.kt:2:10: error: 'impl' constructor of 'Foo' has no corresponding 'header' declaration
     impl constructor(s: Array<String>)
          ^

compiler/testData/multiplatform/classScopes/functionIncorrectSignature/output.txt

@@ -5,18 +5,9 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/functionIncorrectSignature/jvm.kt:1:12: error: 'impl' class 'Foo' has no corresponding 'header' declaration
-The following declaration is incompatible because some members are not implemented:
-    public final header class Foo
-No implementations are found for members listed below:
-
+compiler/testData/multiplatform/classScopes/functionIncorrectSignature/jvm.kt:2:5: error: 'impl' function 'function' has no corresponding 'header' declaration
+The following declaration is incompatible because return type is different:
     public final header fun function(b: ByteArray): Int
 
-    The following declaration is incompatible because return type is different:
-        public final impl fun function(b: ByteArray): Long
-
-impl class Foo {
-           ^
-compiler/testData/multiplatform/classScopes/functionIncorrectSignature/jvm.kt:2:5: error: 'impl' function 'function' has no corresponding 'header' declaration
     impl fun function(b: ByteArray): Long = b.size.toLong()
     ^

compiler/testData/multiplatform/classScopes/functionIncorrectSignatureFromSuperclass/common.kt

@@ -0,0 +1,3 @@
+header class Foo {
+    fun function(b: ByteArray): Int
+}

compiler/testData/multiplatform/classScopes/functionIncorrectSignatureFromSuperclass/jvm.kt

@@ -0,0 +1,5 @@
+open class Base {
+    fun function(b: ByteArray): Long = b.size.toLong()
+}
+
+impl class Foo : Base()

compiler/testData/multiplatform/classScopes/functionIncorrectSignatureFromSuperclass/output.txt

@@ -0,0 +1,16 @@
+-- Common --
+Exit code: OK
+Output:
+
+-- JVM --
+Exit code: COMPILATION_ERROR
+Output:
+compiler/testData/multiplatform/classScopes/functionIncorrectSignatureFromSuperclass/jvm.kt:5:12: error: 'impl' class 'Foo' has no implementation of 'header' class members:
+
+    public final header fun function(b: ByteArray): Int
+
+    The following declaration is incompatible because return type is different:
+        public final fun function(b: ByteArray): Long
+
+impl class Foo : Base()
+           ^

compiler/testData/multiplatform/classScopes/missingConstructor/output.txt

@@ -5,10 +5,7 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/missingConstructor/jvm.kt:1:12: error: 'impl' class 'Foo' has no corresponding 'header' declaration
-The following declaration is incompatible because some members are not implemented:
-    public final header class Foo
-No implementations are found for members listed below:
+compiler/testData/multiplatform/classScopes/missingConstructor/jvm.kt:1:12: error: 'impl' class 'Foo' has no implementation of 'header' class members:
 
     public constructor Foo(s: String)
 

compiler/testData/multiplatform/classScopes/missingFunction/output.txt

@@ -5,10 +5,7 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/missingFunction/jvm.kt:1:12: error: 'impl' class 'Foo' has no corresponding 'header' declaration
-The following declaration is incompatible because some members are not implemented:
-    public final header class Foo
-No implementations are found for members listed below:
+compiler/testData/multiplatform/classScopes/missingFunction/jvm.kt:1:12: error: 'impl' class 'Foo' has no implementation of 'header' class members:
 
     public final header fun function(s: String): Unit