[FIR] Support TypeVariableMarker.isReified

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/valueOfOrNull.kt

@@ -0,0 +1,19 @@
+enum class SomeEnum {
+    ENTRY;
+}
+
+fun foo(s: String?) {
+    val result = s?.let { valueOfOrNull(it) } ?: SomeEnum.ENTRY
+    val result2 = s?.let { valueOfOrNull<SomeEnum>(it) } ?: SomeEnum.ENTRY
+    val result3 = if (s == null) SomeEnum.ENTRY else valueOfOrNull(s)
+    val result4 = if (s == null) SomeEnum.ENTRY else s.let { valueOfOrNull(it) }
+}
+
+inline fun <reified E : Enum<E>> valueOfOrNull(value: String): E? {
+    for (enumValue in enumValues<E>()) {
+        if (enumValue.name == value) {
+            return enumValue
+        }
+    }
+    return null
+}