FIR: support resolving to objects

compiler/testData/ir/irText/expressions/implicitCastOnPlatformType.fir.txt

@@ -1,6 +0,0 @@
-FILE fqName:<root> fileName:/implicitCastOnPlatformType.kt
-  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.String 
-    BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test (): kotlin.String declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Unresolved name: getProperty>#' type=IrErrorType
-          CONST String type=kotlin.String value="test"

compiler/testData/ir/irText/expressions/implicitCastOnPlatformType.kt

@@ -1,2 +1,4 @@
+// FIR_IDENTICAL
+
 fun test(): String =
         System.getProperty("test")

compiler/testData/ir/irText/stubs/javaStaticMethod.fir.txt

@@ -1,5 +0,0 @@
-FILE fqName:<root> fileName:/javaStaticMethod.kt
-  FUN name:test visibility:public modality:FINAL <> () returnType:IrErrorType 
-    BLOCK_BODY
-      RETURN type=kotlin.Nothing from='public final fun test (): IrErrorType declared in <root>'
-        ERROR_CALL 'Unresolved reference: <Unresolved name: bar>#' type=IrErrorType

compiler/testData/ir/irText/stubs/javaStaticMethod.kt

@@ -6,5 +6,6 @@ public class J {
 }
 
 // FILE: javaStaticMethod.kt
+// FIR_IDENTICAL
 
 fun test() = J.bar()