[FIR] Replace usages of FirExpression.typeRef with coneTypeOrNull

#KT-59855 Fixed

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

@@ -17,7 +17,7 @@ class MyColor(val x: Color.<!ENUM_ENTRY_AS_TYPE!>RED<!>, y: Color.<!ENUM_ENTRY_A
         class Local : Color.<!ENUM_ENTRY_AS_TYPE!>RED<!>
         fun local(arg: Color.<!ENUM_ENTRY_AS_TYPE!>RED<!>): Color.<!ENUM_ENTRY_AS_TYPE!>RED<!> = arg
         val temp: Color.<!ENUM_ENTRY_AS_TYPE!>RED<!> = Color.RED
-        temp as? Color.<!ENUM_ENTRY_AS_TYPE, ENUM_ENTRY_AS_TYPE!>RED<!>
+        temp as? Color.<!ENUM_ENTRY_AS_TYPE!>RED<!>
         if (temp is <!IS_ENUM_ENTRY!>Color.RED<!>) {
         return temp as Color.<!ENUM_ENTRY_AS_TYPE!>RED<!>
     }

compiler/testData/diagnostics/tests/kt49438.fir.kt

@@ -1,7 +1,7 @@
 fun <K> foo(x: K) {}
 val x1 = foo<(<!UNRESOLVED_REFERENCE!>unresolved<!>) -> Float> { it.<!UNRESOLVED_REFERENCE!>toFloat<!>() }
 val x2 = foo<(<!UNRESOLVED_REFERENCE!>unresolved<!>) -> Float> { <!CANNOT_INFER_PARAMETER_TYPE!>it<!> -> it.<!UNRESOLVED_REFERENCE!>toFloat<!>() }
-val x3 = foo<<!UNRESOLVED_REFERENCE!>unresolved<!>.() -> Float> { this.<!UNRESOLVED_REFERENCE!>toFloat<!>() }
+val x3 = foo<<!UNRESOLVED_REFERENCE!>unresolved<!>.() -> Float> { <!CANNOT_INFER_PARAMETER_TYPE!>this<!>.<!UNRESOLVED_REFERENCE!>toFloat<!>() }
 val x4 = foo<(Array<<!UNRESOLVED_REFERENCE!>unresolved<!>>) -> Int> { it.size }
 
 fun <T> bar() = foo<(T) -> String> { it.toString() }

compiler/testData/diagnostics/tests/resolve/HiddenDeclarations.fir.kt

@@ -40,7 +40,7 @@ open class A {
     fun foo() {
         <!UNRESOLVED_REFERENCE!>topLevelFun<!>()
         <!UNRESOLVED_REFERENCE!>topLevelFun<!>(1)
-        <!UNRESOLVED_REFERENCE!>topLevelProperty<!><!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>++<!>
+        <!UNRESOLVED_REFERENCE!>topLevelProperty<!><!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>++<!>
         "".<!UNRESOLVED_REFERENCE!>topLevelExtensionFun<!>()
         1.<!UNRESOLVED_REFERENCE!>topLevelExtensionFun<!>()
         "".<!UNRESOLVED_REFERENCE!>topLevelExtensionProperty<!>

compiler/testData/diagnostics/tests/smartCasts/variables/reassignedDependency.fir.kt

@@ -75,3 +75,12 @@ fun test5() {
     c.x<!UNSAFE_CALL!>.<!>length // bad
     d.x.length // ok
 }
+
+fun test6() {
+    var c: C? = null
+    var maybeC: C? = C("")
+    if (c == null) {
+        c = maybeC ?: throw Exception()
+    }
+    c.x
+}

compiler/testData/diagnostics/tests/smartCasts/variables/reassignedDependency.kt

@@ -75,3 +75,12 @@ fun test5() {
     c.x<!UNSAFE_CALL!>.<!>length // bad
     <!DEBUG_INFO_SMARTCAST!>d.x<!>.length // ok
 }
+
+fun test6() {
+    var c: C? = null
+    var maybeC: C? = C("")
+    if (c == null) {
+        c = maybeC ?: throw Exception()
+    }
+    <!DEBUG_INFO_SMARTCAST!>c<!>.x
+}

compiler/testData/diagnostics/testsWithStdLib/builderInference/typeVariableShouldNotBeFixed.fir.kt

@@ -25,7 +25,7 @@ fun <M> materialize(): Processor<M> = TODO()
 private fun foo(model: Model) {
     <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER("M")!>materialize<!>().<!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER("T")!>apply<!> {
         context(
-            this,
+            <!CANNOT_INFER_PARAMETER_TYPE!>this<!>,
             Exec { m, p -> p.process(m) } // Note: Builder inference
         )
     }