FIR: add test for #KT-49438 Obsolete

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

@@ -0,0 +1,2 @@
+fun <K> foo(x: K) {}
+val x = foo<(<!UNRESOLVED_REFERENCE!>unresolved<!>) -> Float> { it.<!UNRESOLVED_REFERENCE!>toFloat<!>() }

compiler/testData/diagnostics/tests/kt49438.kt

@@ -0,0 +1,2 @@
+fun <K> foo(x: K) {}
+val x = foo<(<!UNRESOLVED_REFERENCE!>unresolved<!>) -> Float> { <!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>it<!>.<!DEBUG_INFO_MISSING_UNRESOLVED!>toFloat<!>() }

compiler/testData/diagnostics/tests/kt49438.txt

@@ -0,0 +1,4 @@
+package
+
+public val x: kotlin.Unit
+public fun </*0*/ K> foo(/*0*/ x: K): kotlin.Unit