LV 2.0: update some CLI tests with warnings to use DIVISION_BY_ZERO warning

compiler/testData/cli/jvm/readingConfigFromEnvironment/appendingArgs.kt

@@ -1,5 +1,5 @@
 package kotlin
 
-fun main() {
-    val x = 1?.dec()
+fun foo(arg: Int) {
+    val x = arg / 0
 }

compiler/testData/cli/jvm/readingConfigFromEnvironment/appendingArgs.out

@@ -1 +1,4 @@
+compiler/testData/cli/jvm/readingConfigFromEnvironment/appendingArgs.kt:4:13: warning: [DIVISION_BY_ZERO] Division by zero.
+    val x = arg / 0
+            ^
 OK

compiler/testData/cli/jvm/werror.args

@@ -1,5 +1,4 @@
 $TESTDATA_DIR$/werror.kt
 -d
 $TEMP_DIR$
--XXLanguage\:+EnableDfaWarningsInK2
 -Werror

compiler/testData/cli/jvm/werror.kt

@@ -1,4 +1,4 @@
-fun foo(s: String, t: String?) {
-    s!!
-    t?.toString()
+fun foo(a: Int, b: Int) {
+    println(a / 0)
+    println(b / 0)
 }

compiler/testData/cli/jvm/werror.out

@@ -1,14 +1,8 @@
-warning: ATTENTION!
-This build uses unsafe internal compiler arguments:
-
--XXLanguage:+EnableDfaWarningsInK2
-
-This mode is not recommended for production use,
-as no stability/compatibility guarantees are given on
-compiler or generated code. Use it at your own risk!
-
 error: warnings found and -Werror specified
-compiler/testData/cli/jvm/werror.kt:2:6: warning: unnecessary non-null assertion (!!) on a non-null receiver of type 'kotlin/String'.
-    s!!
-     ^
+compiler/testData/cli/jvm/werror.kt:2:13: warning: division by zero.
+    println(a / 0)
+            ^
+compiler/testData/cli/jvm/werror.kt:3:13: warning: division by zero.
+    println(b / 0)
+            ^
 COMPILATION_ERROR

compiler/testData/cli/jvm/werrorWithNoWarn.args

@@ -1,6 +1,5 @@
-$TESTDATA_DIR$/werrorWithNoWarn.kt
+$TESTDATA_DIR$/werror.kt
 -d
 $TEMP_DIR$
--XXLanguage\:+EnableDfaWarningsInK2
 -Werror
 -nowarn

compiler/testData/cli/jvm/werrorWithNoWarn.kt

@@ -1,4 +0,0 @@
-fun foo(s: String, t: String?) {
-    s!!
-    t?.toString()
-}

compiler/testData/cli/jvm/werrorWithNoWarn.out

@@ -1,14 +1,8 @@
-warning: ATTENTION!
-This build uses unsafe internal compiler arguments:
-
--XXLanguage:+EnableDfaWarningsInK2
-
-This mode is not recommended for production use,
-as no stability/compatibility guarantees are given on
-compiler or generated code. Use it at your own risk!
-
 error: warnings found and -Werror specified
-compiler/testData/cli/jvm/werrorWithNoWarn.kt:2:6: warning: unnecessary non-null assertion (!!) on a non-null receiver of type 'kotlin/String'.
-    s!!
-     ^
+compiler/testData/cli/jvm/werror.kt:2:13: warning: division by zero.
+    println(a / 0)
+            ^
+compiler/testData/cli/jvm/werror.kt:3:13: warning: division by zero.
+    println(b / 0)
+            ^
 COMPILATION_ERROR

compiler/testData/cli/jvm/werrorWithStrongWarning.args

@@ -1,4 +1,4 @@
-$TESTDATA_DIR$/werrorWithStrongWarning.kt
+$TESTDATA_DIR$/werror.kt
 -Xdisable-default-scripting-plugin
 -d
 $TEMP_DIR$

compiler/testData/cli/jvm/werrorWithStrongWarning.kt

@@ -1,4 +0,0 @@
-fun foo(s: String, t: String?) {
-    s!!
-    t?.toString()
-}