[FIR] Assume SafeCallsAreAlwaysNullable is always on

compiler/testData/diagnostics/tests/SafeCallNonNullReceiver.fir.kt

@@ -0,0 +1,7 @@
+// !LANGUAGE: -SafeCallsAreAlwaysNullable
+// http://youtrack.jetbrains.net/issue/KT-418
+
+fun ff() {
+    val i: Int = 1
+    val a: Int = <!INITIALIZER_TYPE_MISMATCH!>i<!SAFE_CALL_WILL_CHANGE_NULLABILITY!><!UNNECESSARY_SAFE_CALL!>?.<!>plus(2)<!><!>
+}

compiler/testData/diagnostics/tests/SafeCallNonNullReceiver.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // !LANGUAGE: -SafeCallsAreAlwaysNullable
 // http://youtrack.jetbrains.net/issue/KT-418
 

compiler/testData/diagnostics/tests/controlFlowAnalysis/throwInLambda.fir.kt

@@ -8,6 +8,6 @@ fun foo(): String {
 }
 fun bar(): String {
     val x = fn() ?: return ""
-    val y = x<!SAFE_CALL_WILL_CHANGE_NULLABILITY!><!UNNECESSARY_SAFE_CALL!>?.<!>let { throw Exception() }<!> <!USELESS_ELVIS!>?: "unreachable"<!>
+    val y = x<!SAFE_CALL_WILL_CHANGE_NULLABILITY!><!UNNECESSARY_SAFE_CALL!>?.<!>let { throw Exception() }<!> ?: "unreachable"
     return y
 }

compiler/testData/diagnostics/tests/nullableTypes/safeCallOnNotNullableType.fir.kt

@@ -0,0 +1,34 @@
+// LANGUAGE: -SafeCallsAreAlwaysNullable
+// DIAGNOSTICS: -UNNECESSARY_SAFE_CALL
+// ISSUE: KT-46860
+
+interface A {
+    fun id(): A
+
+    fun foo(): String
+}
+
+fun test_1(a: A) {
+    val s = a.id().id().id().id().id().id().id().id()<!SAFE_CALL_WILL_CHANGE_NULLABILITY!>?.foo()<!><!UNSAFE_CALL!>.<!>length
+}
+
+fun test_2(a: A) {
+    val s = a.id()
+        .id()
+        .id()
+        .id()
+        <!SAFE_CALL_WILL_CHANGE_NULLABILITY!>?.id()<!>
+        <!UNSAFE_CALL!>.<!>id()
+        .id()
+        .id()
+        <!SAFE_CALL_WILL_CHANGE_NULLABILITY!>?.foo()<!>
+        ?.length
+}
+
+fun test_3(a: A) {
+    val s = a.id()<!SAFE_CALL_WILL_CHANGE_NULLABILITY!>?.
+        id()<!><!UNSAFE_CALL!>.<!>
+        id()<!SAFE_CALL_WILL_CHANGE_NULLABILITY!>?.
+        foo()<!><!UNSAFE_CALL!>.<!>
+        length
+}

compiler/testData/diagnostics/tests/nullableTypes/safeCallOnNotNullableType.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // LANGUAGE: -SafeCallsAreAlwaysNullable
 // DIAGNOSTICS: -UNNECESSARY_SAFE_CALL
 // ISSUE: KT-46860