Add Kotlin 1.7 language version

compiler/backend/src/org/jetbrains/kotlin/codegen/state/GenerationState.kt

@@ -407,6 +407,7 @@ class GenerationState private constructor(
             this[KOTLIN_1_4] = JvmMetadataVersion(1, 4, 3)
             this[KOTLIN_1_5] = JvmMetadataVersion.INSTANCE
             this[KOTLIN_1_6] = JvmMetadataVersion(1, 6, 0)
+            this[KOTLIN_1_7] = JvmMetadataVersion(1, 7, 0)
 
             check(size == LanguageVersion.values().size) {
                 "Please add mappings from the missing LanguageVersion instances to the corresponding JvmMetadataVersion " +

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/directives/LanguageSettingsDirectives.kt

@@ -83,6 +83,7 @@ object LanguageSettingsDirectives : SimpleDirectivesContainer() {
 
     fun parseApiVersion(versionString: String): ApiVersion = when (versionString) {
         "LATEST" -> ApiVersion.LATEST
+        "LATEST_STABLE" -> ApiVersion.LATEST_STABLE
         else -> ApiVersion.parse(versionString) ?: error("Unknown API version: $versionString")
     }
 }

compiler/testData/cli/jvm/apiVersionInvalid.out

@@ -1,3 +1,3 @@
 error: unknown API version: 239.42
-Supported API versions: 1.3 (DEPRECATED), 1.4, 1.5, 1.6 (EXPERIMENTAL)
+Supported API versions: 1.3 (DEPRECATED), 1.4, 1.5, 1.6 (EXPERIMENTAL), 1.7 (EXPERIMENTAL)
 COMPILATION_ERROR

compiler/testData/cli/jvm/languageVersionInvalid.out

@@ -1,3 +1,3 @@
 error: unknown language version: 239.42
-Supported language versions: 1.3 (DEPRECATED), 1.4, 1.5, 1.6 (EXPERIMENTAL)
+Supported language versions: 1.3 (DEPRECATED), 1.4, 1.5, 1.6 (EXPERIMENTAL), 1.7 (EXPERIMENTAL)
 COMPILATION_ERROR

compiler/testData/codegen/bytecodeText/inlineClasses/resultApiEqualsDoesntBox.kt

@@ -1,4 +1,4 @@
-// !API_VERSION: LATEST
+// !API_VERSION: LATEST_STABLE
 // WITH_RUNTIME
 // FILE: test.kt
 fun test() {

compiler/testData/codegen/bytecodeText/notNullAssertions/assertionForNotNullTypeParam_1_4.kt

@@ -1,4 +1,4 @@
-// !API_VERSION: LATEST
+// !API_VERSION: LATEST_STABLE
 
 fun <T : Any> foo(t: T) = t
 

compiler/testData/codegen/bytecodeText/nullCheckOptimization/multipleExclExcl_1_4.kt

@@ -1,4 +1,4 @@
-// !API_VERSION: LATEST
+// !API_VERSION: LATEST_STABLE
 
 fun test(s: String?): Int {
     s!!

compiler/testData/codegen/bytecodeText/nullCheckOptimization/nullCheckAfterExclExcl_1_4.kt

@@ -1,4 +1,4 @@
-// !API_VERSION: LATEST
+// !API_VERSION: LATEST_STABLE
 
 fun test(s: String?): Int {
     s!!

compiler/testData/codegen/bytecodeText/nullCheckOptimization/redundantSafeCall_1_4.kt

@@ -1,8 +1,8 @@
-// !API_VERSION: LATEST
+// !API_VERSION: LATEST_STABLE
 
 fun test(s: String) = s?.length
 
 // 0 IFNULL
 // 0 IFNONNULL
 // 0 intValue
-// 1 valueOf
+// 0 valueOf

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -315,6 +315,7 @@ enum class LanguageVersion(val major: Int, val minor: Int) : DescriptionAware {
     KOTLIN_1_4(1, 4),
     KOTLIN_1_5(1, 5),
     KOTLIN_1_6(1, 6),
+    KOTLIN_1_7(1, 7),
     ;
 
     val isStable: Boolean