Switch JVM target of the standard libraries to 1.8 #KT-51907

compiler/compiler.version/build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
 
 // This module does not apply Kotlin plugin, so we are setting toolchain via
 // java extension
-configureJavaOnlyToolchain(JdkMajorVersion.JDK_1_6)
+configureJavaOnlyToolchain(JdkMajorVersion.JDK_1_8)
 
 val kotlinVersion: String by rootProject.extra
 

compiler/tests-common-jvm6/build.gradle.kts

@@ -3,7 +3,7 @@ plugins {
     id("jps-compatible")
 }
 
-project.updateJvmTarget("1.6")
+project.updateJvmTarget("1.6") // Should this project be removed altogether ?
 
 dependencies {
     api(kotlinStdlib())

compiler/tests-different-jdk/build.gradle.kts

@@ -50,6 +50,7 @@ fun Project.codegenTest(
     group = "verification"
 }
 
+// Should the tests with target = 6 be removed ?
 codegenTest(
     target = 6,
     jdk = JdkMajorVersion.JDK_1_8,