[FIR] Expand typealias for correct approximation of types (particularly Int and Long)

compiler/testData/diagnostics/tests/typealias/intToLongApproximationThroughTypeAlias.kt

@@ -0,0 +1,6 @@
+// FIR_IDENTICAL
+typealias Hash = Long
+
+fun foo(): Hash {
+    return 0
+}

compiler/testData/diagnostics/tests/typealias/intToLongApproximationThroughTypeAlias.txt

@@ -0,0 +1,4 @@
+package
+
+public fun foo(): Hash /* = kotlin.Long */
+public typealias Hash = kotlin.Long