stdlib: Add first() extension for CharSequence
stdlib: Add first() extension for CharSequence

JuliusKunze/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,wiltonlazary/kotlin-native,JuliusKunze/kotlin-native,jiaminglu/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,jiaminglu/kotlin-native,jiaminglu/kotlin-native,JetBrains/kotlin-native,jiaminglu/kotlin-native,JetBrains/kotlin-native,jiaminglu/kotlin-native,wiltonlazary/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,jiaminglu/kotlin-native,wiltonlazary/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,jiaminglu/kotlin-native,JetBrains/kotlin-native,JetBrains/kotlin-native,jiaminglu/kotlin-native,JuliusKunze/kotlin-native,JuliusKunze/kotlin-native