FIR checker: warn unnecessary safe calls

compiler/testData/diagnostics/tests/inference/findViewById.fir.kt

@@ -55,5 +55,5 @@ fun test2(t: Test?) {
     val xSafeCallSafeCastExplicitType = t?.findViewById<X>(0) as? X
 
     val xSafeCallCast = t?.findViewById(0) as X
-    val xSafeCallCastExplicitType = t?.findViewById<X>(0) as X
+    val xSafeCallCastExplicitType = t<!UNNECESSARY_SAFE_CALL!>?.<!>findViewById<X>(0) as X
 }

compiler/testData/diagnostics/tests/inference/nestedCalls/makeNullableIfSafeCall.fir.kt

@@ -11,7 +11,7 @@ interface B {
 
 fun test(u: A?, x: A?, y: A?, z: A?, w: A, v: A?) {
     u?.b?.foo()!! // was UNNECESSARY_SAFE_CALL everywhere, because result type (of 'foo()') wasn't made nullable
-    u!!.b?.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    u!!.b<!UNNECESSARY_SAFE_CALL!>?.<!>foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
     x?.b!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
     // x?.b is not null
     x!!.b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
@@ -22,7 +22,7 @@ fun test(u: A?, x: A?, y: A?, z: A?, w: A, v: A?) {
     // z?.nb is not null
     z!!.nb!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
 
-    w.b?.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    w.b<!UNNECESSARY_SAFE_CALL!>?.<!>foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
     w.b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
     w.nb?.foo()!!
     w.nb!!.foo()<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>

compiler/testData/diagnostics/tests/inference/publicApproximation/smartCastInLambdaReturnAfterIntersection.fir.kt

@@ -18,5 +18,5 @@ fun smartCastAfterIntersection(a: One, b: Two) = run {
 }
 
 fun test(one: One, two: Two) {
-    smartCastAfterIntersection(one, two)?.<!UNRESOLVED_REFERENCE!>base<!>()
+    smartCastAfterIntersection(one, two)<!UNNECESSARY_SAFE_CALL!>?.<!><!UNRESOLVED_REFERENCE!>base<!>()
 }