Support patch versions in RequireKotlin with kind=COMPILER_VERSION

core/util.runtime/src/org/jetbrains/kotlin/config/KotlinCompilerVersion.java

@@ -16,6 +16,8 @@
 
 package org.jetbrains.kotlin.config;
 
+import org.jetbrains.annotations.Nullable;
+
 public class KotlinCompilerVersion {
     // The value of this constant is generated by the build script
     // DON'T MODIFY IT
@@ -38,6 +40,15 @@ public class KotlinCompilerVersion {
         return IS_PRE_RELEASE;
     }
 
+    /**
+     * @return version of this compiler, or `null` if it isn't known (if VERSION is "@snapshot@")
+     */
+    @Nullable
+    public static String getVersion() {
+        //noinspection ConstantConditions
+        return VERSION.equals("@snapshot@") ? null : VERSION;
+    }
+
     static {
         //noinspection ConstantConditions
         if (!VERSION.equals("@snapshot@") && !VERSION.contains("-") && IS_PRE_RELEASE) {