Remove :compiler:tests-common-jvm6 project and JvmTarget6OnBaseJvm tests

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

@@ -3,8 +3,6 @@ plugins {
     id("jps-compatible")
 }
 
-val testJvm6ServerRuntime by configurations.creating
-
 dependencies {
     testApi(projectTests(":compiler"))
     testApi(projectTests(":compiler:test-infrastructure"))
@@ -16,7 +14,6 @@ dependencies {
 
     testImplementation(intellijCore())
     testRuntimeOnly(project(":kotlin-reflect"))
-    testJvm6ServerRuntime(projectTests(":compiler:tests-common-jvm6"))
 }
 
 sourceSets {
@@ -50,44 +47,16 @@ fun Project.codegenTest(
     group = "verification"
 }
 
-// Should the tests with target = 6 be removed ?
-codegenTest(
-    target = 6,
-    jdk = JdkMajorVersion.JDK_1_8,
-    jvm = JdkMajorVersion.JDK_1_6.majorVersion.toString()
-) {
-    dependsOn(testJvm6ServerRuntime)
-
-    doFirst {
-        systemProperty("kotlin.test.default.jvm.target", "1.6")
-        systemProperty("kotlin.test.java.compilation.target", "1.6")
-        systemProperty(
-            "JDK_16",
-            project.getToolchainLauncherFor(JdkMajorVersion.JDK_1_6).get().metadata.installationPath.asFile.absolutePath
-        )
-
-        val port = project.findProperty("kotlin.compiler.codegen.tests.port") ?: "5100"
-        systemProperty("kotlin.test.box.in.separate.process.port", port)
-        systemProperty("kotlin.test.box.in.separate.process.server.classpath", testJvm6ServerRuntime.asPath)
-    }
-}
-
 //JDK 8
-codegenTest(target = 6, jdk = JdkMajorVersion.JDK_1_8)
-
 // This is default one and is executed in default build configuration
 codegenTest(target = 8, jdk = JdkMajorVersion.JDK_1_8)
 
 //JDK 11
-codegenTest(target = 6, jdk = JdkMajorVersion.JDK_11)
-
 codegenTest(target = 8, jdk = JdkMajorVersion.JDK_11)
 
 codegenTest(target = 11, jdk = JdkMajorVersion.JDK_11)
 
 //JDK 17
-codegenTest(target = 6, jdk = JdkMajorVersion.JDK_17)
-
 codegenTest(target = 8, jdk = JdkMajorVersion.JDK_17)
 
 codegenTest(target = 17, jdk = JdkMajorVersion.JDK_17) {
@@ -98,7 +67,6 @@ codegenTest(target = 17, jdk = JdkMajorVersion.JDK_17) {
 val mostRecentJdk = JdkMajorVersion.values().last()
 
 //LAST JDK from JdkMajorVersion available on machine
-codegenTest(target = 6, jvm = "Last", jdk = mostRecentJdk)
 codegenTest(target = 8, jvm = "Last", jdk = mostRecentJdk)
 
 codegenTest(