Switch default JVM target to 1.8

#KT-29405 Fixed

compiler/testData/codegen/box/annotations/typeAnnotationOnJdk6.kt

@@ -1,5 +1,6 @@
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
+// JVM_TARGET: 1.6
 
 @Target(AnnotationTarget.TYPE)
 annotation class A

compiler/testData/codegen/box/functions/bigArity/callWithIncorrectNumberOfArguments_1_6.kt

@@ -0,0 +1,71 @@
+// !LANGUAGE: +FunctionTypesWithBigArity
+// WITH_RUNTIME
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.6
+// FILE: J.java
+
+// import kotlin.jvm.functions.Arity;
+import kotlin.jvm.functions.FunctionN;
+import kotlin.Unit;
+import java.util.Arrays;
+
+public class J {
+    // TODO: uncomment arity as soon as Arity is introduced
+    public static void test(/* @Arity(30) */ FunctionN<Unit> f) {
+        Object o = new Object();
+        for (int i = 0; i < 42; i++) {
+            if (i == 30) continue;
+
+            Object[] args = new Object[i];
+            Arrays.fill(args, o);
+            try {
+                f.invoke(args);
+            } catch (IllegalArgumentException e) {
+                // OK
+
+                if (!e.getMessage().contains("30")) {
+                    throw new AssertionError("Exception must specify the expected number of arguments: " + e.getMessage(), e);
+                }
+
+                continue;
+            } catch (Throwable e) {
+                throw new AssertionError(
+                        "Incorrect exception (IllegalArgumentException expected): " + e.getClass().getName() + ", i = " + i, e
+                );
+            }
+            throw new AssertionError("IllegalArgumentException expected, but nothing was thrown, i = " + i);
+        }
+    }
+}
+
+// FILE: K.kt
+
+fun foo(
+    p00: Any?, p01: Any?, p02: Any?, p03: Any?, p04: Any?, p05: Any?, p06: Any?, p07: Any?, p08: Any?, p09: Any?,
+    p10: Any?, p11: Any?, p12: Any?, p13: Any?, p14: Any?, p15: Any?, p16: Any?, p17: Any?, p18: Any?, p19: Any?,
+    p20: Any?, p21: Any?, p22: Any?, p23: Any?, p24: Any?, p25: Any?, p26: Any?, p27: Any?, p28: Any?, p29: Any?
+) {}
+
+class Fun : (Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?,
+             Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?) -> Unit {
+    override fun invoke(
+        p00: Any?, p01: Any?, p02: Any?, p03: Any?, p04: Any?, p05: Any?, p06: Any?, p07: Any?, p08: Any?, p09: Any?,
+        p10: Any?, p11: Any?, p12: Any?, p13: Any?, p14: Any?, p15: Any?, p16: Any?, p17: Any?, p18: Any?, p19: Any?,
+        p20: Any?, p21: Any?, p22: Any?, p23: Any?, p24: Any?, p25: Any?, p26: Any?, p27: Any?, p28: Any?, p29: Any?
+    ) {}
+}
+
+fun box(): String {
+    val lambda: Function30<
+            Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?,
+            Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?,
+            Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?, Any?,
+            Unit> = { _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _ -> }
+    @Suppress("DEPRECATION_ERROR")
+    J.test(lambda as kotlin.jvm.functions.FunctionN<Unit>)
+    @Suppress("DEPRECATION_ERROR")
+    J.test(::foo as kotlin.jvm.functions.FunctionN<Unit>)
+    @Suppress("DEPRECATION_ERROR")
+    J.test(Fun() as kotlin.jvm.functions.FunctionN<Unit>)
+    return "OK"
+}

compiler/testData/codegen/box/reflection/annotations/onTypes/arrayKClass.kt

@@ -1,6 +1,7 @@
 // IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // WITH_REFLECT
+// JVM_TARGET: 1.6
 
 import kotlin.reflect.KClass
 

compiler/testData/codegen/box/super/interfaceHashCode.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface I
 class C : I { fun foo() = super<I>.hashCode() }
 

compiler/testData/codegen/box/super/interfaceHashCode_1_6.kt

@@ -0,0 +1,11 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// JVM_TARGET: 1.6
+
+interface I
+class C : I { fun foo() = super<I>.hashCode() }
+
+fun box(): String {
+    C().foo()
+    return "OK"
+}