Tests: fix stdlib declarations in IR interpreter test data

Fix some unresolved supertypes. This is necessary to be able to enable
IR fake override builder by default (KT-61514), because it traverses all
supertypes and asserts that they're classes, so that it can build fake
overrides for declarations from there. Without this change, for example
`IrFakeOverrideBuilder.buildFakeOverridesForClass` would crash.

compiler/testData/ir/interpreter/helpers/Regex.kt

@@ -0,0 +1,64 @@
+package kotlin.text
+
+public class Regex {
+    public constructor(pattern: String) = TODO()
+
+    public constructor(pattern: String, option: RegexOption) = TODO()
+
+    public constructor(pattern: String, options: Set<RegexOption>) = TODO()
+
+    public val pattern: String
+        get() = TODO()
+
+    public val options: Set<RegexOption>
+        get() = TODO()
+
+    public fun matchEntire(input: CharSequence): MatchResult? = TODO()
+
+    public infix fun matches(input: CharSequence): Boolean = TODO()
+
+    @SinceKotlin("1.7")
+    @WasExperimental(ExperimentalStdlibApi::class)
+    public fun matchAt(input: CharSequence, index: Int): MatchResult? = TODO()
+
+    @SinceKotlin("1.7")
+    @WasExperimental(ExperimentalStdlibApi::class)
+    public fun matchesAt(input: CharSequence, index: Int): Boolean = TODO()
+
+    public fun containsMatchIn(input: CharSequence): Boolean = TODO()
+
+    public fun replace(input: CharSequence, replacement: String): String = TODO()
+
+    public fun replace(input: CharSequence, transform: (MatchResult) -> CharSequence): String = TODO()
+
+    public fun replaceFirst(input: CharSequence, replacement: String): String = TODO()
+
+    public fun find(input: CharSequence, startIndex: Int = 0): MatchResult? = TODO()
+
+    public fun findAll(input: CharSequence, startIndex: Int = 0): Sequence<MatchResult> = TODO()
+
+    public fun split(input: CharSequence, limit: Int = 0): List<String> = TODO()
+
+    @SinceKotlin("1.6")
+    @WasExperimental(ExperimentalStdlibApi::class)
+    public fun splitToSequence(input: CharSequence, limit: Int = 0): Sequence<String> = TODO()
+
+    public companion object {
+        public fun fromLiteral(literal: String): Regex = TODO()
+
+        public fun escape(literal: String): String = TODO()
+
+        public fun escapeReplacement(literal: String): String = TODO()
+    }
+}
+
+public class MatchGroup {
+    public val value: String
+        get() = TODO()
+}
+
+public enum class RegexOption {
+    IGNORE_CASE,
+
+    MULTILINE
+}