Migrate deprecations in core, compiler, idea, tests

Replacing deprecated Char.toInt() with Char.code and
Number.toChar() with Number.toInt().toChar(), where Number is not Int.

KT-23451

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/AbstractAnnotationDeserializer.kt

@@ -243,7 +243,7 @@ abstract class AbstractAnnotationDeserializer(
                 const(kind, value.intValue)
             }
 
-            CHAR -> const(ConstantValueKind.Char, value.intValue.toChar())
+            CHAR -> const(ConstantValueKind.Char, value.intValue.toInt().toChar())
             FLOAT -> const(ConstantValueKind.Float, value.floatValue)
             DOUBLE -> const(ConstantValueKind.Double, value.doubleValue)
             BOOLEAN -> const(ConstantValueKind.Boolean, (value.intValue != 0L))

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/FirConstDeserializer.kt

@@ -54,7 +54,7 @@ class FirConstDeserializer(
     ): FirExpression? {
         return when (constKind) {
             "BYTE", "B" -> buildConstExpression(null, ConstantValueKind.Byte, ((protoValue?.intValue ?: sourceValue) as Number).toByte())
-            "CHAR", "C" -> buildConstExpression(null, ConstantValueKind.Char, ((protoValue?.intValue ?: sourceValue) as Number).toChar())
+            "CHAR", "C" -> buildConstExpression(null, ConstantValueKind.Char, ((protoValue?.intValue ?: sourceValue) as Number).toInt().toChar())
             "SHORT", "S" -> buildConstExpression(null, ConstantValueKind.Short, ((protoValue?.intValue ?: sourceValue) as Number).toShort())
             "INT", "I" -> buildConstExpression(null, ConstantValueKind.Int, protoValue?.intValue?.toInt() ?: sourceValue as Int)
             "LONG", "J" -> buildConstExpression(null, ConstantValueKind.Long, protoValue?.intValue ?: sourceValue as Long)

compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirAnnotationArgumentVisitor.kt

@@ -35,7 +35,7 @@ internal object FirAnnotationArgumentVisitor : AnnotationArgumentVisitor<Unit, F
 
     override fun visitCharValue(value: CharValue, data: FirAnnotationArgumentVisitorData) {
         data.builder.type = ProtoBuf.Annotation.Argument.Value.Type.CHAR
-        data.builder.intValue = value.value.toLong()
+        data.builder.intValue = value.value.code.toLong()
     }
 
     override fun visitDoubleValue(value: DoubleValue, data: FirAnnotationArgumentVisitorData) {

compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/constant/ConstantValue.kt

@@ -53,7 +53,7 @@ internal class ByteValue(value: Byte) : IntegerValueConstant<Byte>(value) {
 internal class CharValue(value: Char) : IntegerValueConstant<Char>(value) {
     override fun <R, D> accept(visitor: AnnotationArgumentVisitor<R, D>, data: D): R = visitor.visitCharValue(this, data)
 
-    override fun toString(): String = "\\u%04X ('%s')".format(value.toInt(), getPrintablePart(value))
+    override fun toString(): String = "\\u%04X ('%s')".format(value.code, getPrintablePart(value))
 
     private fun getPrintablePart(c: Char): String = when (c) {
         '\b' -> "\\b"

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -847,10 +847,10 @@ class FirRenderer(builder: StringBuilder, private val mode: RenderMode = RenderM
         if (value !is Char) {
             print(value.toString())
         } else {
-            if (value.toInt() in 32..127) {
+            if (value.code in 32..127) {
                 print(value)
             } else {
-                print(value.toInt())
+                print(value.code)
             }
         }
         print(")")