Restore a removed ClockKt.asClock for legacy classes

Author: dkhalanskyjb

core/api/kotlinx-datetime.api

@@ -13,6 +13,7 @@ public final class kotlinx/datetime/Clock$System : kotlinx/datetime/Clock {
 
 public final class kotlinx/datetime/ClockKt {
 	public static final fun asClock (Lkotlin/time/TimeSource;Lkotlin/time/Instant;)Lkotlin/time/Clock;
+	public static final fun asClock (Lkotlin/time/TimeSource;Lkotlinx/datetime/Instant;)Lkotlinx/datetime/Clock;
 	public static final fun asTimeSource (Lkotlin/time/Clock;)Lkotlin/time/TimeSource$WithComparableMarks;
 	public static final fun asTimeSource (Lkotlinx/datetime/Clock;)Lkotlin/time/TimeSource$WithComparableMarks;
 	public static final fun toDeprecatedClock (Lkotlin/time/Clock;)Lkotlinx/datetime/Clock;

core/api/kotlinx-datetime.klib.api

@@ -1005,6 +1005,7 @@ final fun (kotlin.time/Instant).kotlinx.datetime/until(kotlin.time/Instant, kotl
 final fun (kotlin.time/Instant).kotlinx.datetime/yearsUntil(kotlin.time/Instant, kotlinx.datetime/TimeZone): kotlin/Int // kotlinx.datetime/yearsUntil|yearsUntil@kotlin.time.Instant(kotlin.time.Instant;kotlinx.datetime.TimeZone){}[0]
 final fun (kotlin.time/Instant.Companion).kotlinx.datetime/parse(kotlin/CharSequence, kotlinx.datetime.format/DateTimeFormat<kotlinx.datetime.format/DateTimeComponents>): kotlin.time/Instant // kotlinx.datetime/parse|parse@kotlin.time.Instant.Companion(kotlin.CharSequence;kotlinx.datetime.format.DateTimeFormat<kotlinx.datetime.format.DateTimeComponents>){}[0]
 final fun (kotlin.time/TimeSource).kotlinx.datetime/asClock(kotlin.time/Instant): kotlin.time/Clock // kotlinx.datetime/asClock|asClock@kotlin.time.TimeSource(kotlin.time.Instant){}[0]
+final fun (kotlin.time/TimeSource).kotlinx.datetime/asClock(kotlinx.datetime/Instant): kotlinx.datetime/Clock // kotlinx.datetime/asClock|asClock@kotlin.time.TimeSource(kotlinx.datetime.Instant){}[0]
 final fun (kotlin/String).kotlinx.datetime/toDatePeriod(): kotlinx.datetime/DatePeriod // kotlinx.datetime/toDatePeriod|toDatePeriod@kotlin.String(){}[0]
 final fun (kotlin/String).kotlinx.datetime/toDateTimePeriod(): kotlinx.datetime/DateTimePeriod // kotlinx.datetime/toDateTimePeriod|toDateTimePeriod@kotlin.String(){}[0]
 final fun (kotlin/String).kotlinx.datetime/toInstant(): kotlinx.datetime/Instant // kotlinx.datetime/toInstant|toInstant@kotlin.String(){}[0]

core/common/src/DeprecatedClock.kt

@@ -11,6 +11,7 @@ package kotlinx.datetime
 import kotlin.jvm.JvmMultifileClass
 import kotlin.jvm.JvmName
 import kotlin.time.ExperimentalTime
+import kotlin.time.TimeMark
 import kotlin.time.TimeSource
 
 /**
@@ -124,3 +125,13 @@ public fun Clock.asTimeSource(): TimeSource.WithComparableMarks = toStdlibClock(
 
 @Deprecated("Use Clock.todayIn instead", ReplaceWith("this.toStdlibClock().todayIn(timeZone)"), DeprecationLevel.WARNING)
 public fun Clock.todayAt(timeZone: TimeZone): LocalDate = todayIn(timeZone)
+
+@Deprecated(
+    "kotlin.datetime.Clock is superseded by kotlin.time.Clock",
+    ReplaceWith("this.asClock(origin.toStdlibInstant()).toDeprecatedClock()"),
+    level = DeprecationLevel.WARNING
+)
+public fun TimeSource.asClock(origin: kotlinx.datetime.Instant): kotlinx.datetime.Clock = object : Clock {
+    private val startMark: TimeMark = markNow()
+    override fun now() = origin + startMark.elapsedNow()
+}