Introduce apiVersionIsAtLeast function to branch in inlines

#KT-16028

libraries/stdlib/src/kotlin/internal/PlatformImplementations.kt

@@ -62,3 +62,15 @@ private fun getJavaVersion(): Int {
         default
     }
 }
+
+/**
+ * Constant check of api version used during compilation
+ *
+ * This function is evaluated at compile time to a constant value,
+ * so there should be no references to it in other modules.
+ *
+ * The function usages are validated to have literal argument values.
+ */
+@PublishedApi
+internal fun apiVersionIsAtLeast(major: Int, minor: Int, patch: Int) =
+        KotlinVersion.CURRENT.isAtLeast(major, minor, patch)

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt

@@ -2076,6 +2076,10 @@ public final class kotlin/coroutines/experimental/jvm/internal/CoroutineIntrinsi
 	public static final fun normalizeContinuation (Lkotlin/coroutines/experimental/Continuation;)Lkotlin/coroutines/experimental/Continuation;
 }
 
+public final class kotlin/internal/PlatformImplementationsKt {
+	public static final fun apiVersionIsAtLeast (III)Z
+}
+
 public final class kotlin/io/AccessDeniedException : kotlin/io/FileSystemException {
 	public fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;)V
 	public synthetic fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib.txt

@@ -1895,6 +1895,10 @@ public final class kotlin/coroutines/experimental/jvm/internal/CoroutineIntrinsi
 	public static final fun normalizeContinuation (Lkotlin/coroutines/experimental/Continuation;)Lkotlin/coroutines/experimental/Continuation;
 }
 
+public final class kotlin/internal/PlatformImplementationsKt {
+	public static final fun apiVersionIsAtLeast (III)Z
+}
+
 public final class kotlin/io/AccessDeniedException : kotlin/io/FileSystemException {
 	public fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;)V
 	public synthetic fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V