[FIR] Fix overloading of renamed jvm methods

#KT-48102 Fixed

compiler/testData/diagnostics/tests/declarationChecks/mappedFunctionNotImplemented.kt

@@ -0,0 +1,13 @@
+// KT-48102
+// FIR_IDENTICAL
+
+// FILE: MyCharSequence.java
+public class MyCharSequence implements CharSequence {
+    public char charAt(int index) { return ' '; }
+    public int length() { return 1; }
+    public CharSequence subSequence(int start, int end) { return this; }
+    public String toString() { return " "; }
+}
+
+// FILE: CharSeq.kt
+class KtCharSeq : MyCharSequence() // false-positive 'get' not implemented

compiler/testData/diagnostics/tests/declarationChecks/mappedFunctionNotImplemented.txt

@@ -0,0 +1,21 @@
+package
+
+public final class KtCharSeq : MyCharSequence {
+    public constructor KtCharSeq()
+    public open override /*1*/ /*fake_override*/ val length: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun get(/*0*/ index: kotlin.Int): kotlin.Char
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun subSequence(/*0*/ startIndex: kotlin.Int, /*1*/ endIndex: kotlin.Int): kotlin.CharSequence
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class MyCharSequence : kotlin.CharSequence {
+    public constructor MyCharSequence()
+    public open override /*1*/ val length: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun get(/*0*/ index: kotlin.Int): kotlin.Char
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun subSequence(/*0*/ startIndex: kotlin.Int, /*1*/ endIndex: kotlin.Int): kotlin.CharSequence
+    public open override /*1*/ fun toString(): kotlin.String
+}