[native] Support milestones in meta versions

Add milestones to MetaVersion to replace standalone parameter in
compiler version generator. This makes native version match Kotlin one.

compiler/util-io/src/org/jetbrains/kotlin/konan/CompilerVersion.kt

@@ -12,26 +12,24 @@ interface CompilerVersion : Serializable {
     val major: Int
     val minor: Int
     val maintenance: Int
-    val milestone: Int
     val build: Int
 
     fun toString(showMeta: Boolean, showBuild: Boolean): String
 
     companion object {
         // major.minor.patch-meta-build where patch, meta and build are optional.
-        private val versionPattern = "(\\d+)\\.(\\d+)(?:\\.(\\d+))?(?:-M(\\p{Digit}))?(?:-(\\p{Alpha}\\p{Alnum}*))?(?:-(\\d+))?".toRegex()
+        private val versionPattern = "(\\d+)\\.(\\d+)(?:\\.(\\d+))?(?:-(\\p{Alpha}\\p{Alnum}*))?(?:-(\\d+))?".toRegex()
 
         fun fromString(version: String): CompilerVersion {
-            val (major, minor, maintenance, milestone, metaString, build) =
-                    versionPattern.matchEntire(version)?.destructured
-                        ?: throw IllegalArgumentException("Cannot parse Kotlin/Native version: $version")
+            val (major, minor, maintenance, metaString, build) =
+                versionPattern.matchEntire(version)?.destructured
+                    ?: throw IllegalArgumentException("Cannot parse Kotlin/Native version: $version")
 
             return CompilerVersionImpl(
                 MetaVersion.findAppropriate(metaString),
                 major.toInt(),
                 minor.toInt(),
                 maintenance.toIntOrNull() ?: 0,
-                milestone.toIntOrNull() ?: -1,
                 build.toIntOrNull() ?: -1
             )
         }
@@ -45,7 +43,6 @@ data class CompilerVersionImpl(
     override val major: Int,
     override val minor: Int,
     override val maintenance: Int,
-    override val milestone: Int = 0,
     override val build: Int = -1
 ) : CompilerVersion {
 
@@ -55,10 +52,6 @@ data class CompilerVersionImpl(
         append(minor)
         append('.')
         append(maintenance)
-        if (milestone != -1) {
-            append("-M")
-            append(milestone)
-        }
         if (showMeta) {
             append('-')
             append(meta.metaString)

compiler/util-io/src/org/jetbrains/kotlin/konan/MetaVersion.kt

@@ -13,16 +13,15 @@ package org.jetbrains.kotlin.konan
 enum class MetaVersion(val metaString: String) {
     DEV("dev"),
     EAP("eap"),
-    ALPHA("alpha"),
     BETA("beta"),
-    RC1("rc1"),
-    RC2("rc2"),
+    M1("M1"),
+    M2("M2"),
+    RC("RC"),
     RELEASE("release");
 
     companion object {
-
         fun findAppropriate(metaString: String): MetaVersion {
-            return MetaVersion.values().find { it.metaString.equals(metaString, ignoreCase = true) }
+            return values().find { it.metaString.equals(metaString, ignoreCase = true) }
                 ?: if (metaString.isBlank()) RELEASE else error("Unknown meta version: $metaString")
         }
     }