FIR: add original test from KT-49925 (passes)

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/problems/buildList.fir.txt

@@ -0,0 +1,19 @@
+FILE: buildList.kt
+    public final class Wrapper : R|kotlin/Any| {
+        public constructor(tag: R|kotlin/String|): R|Wrapper| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val tag: R|kotlin/String| = R|<local>/tag|
+            public get(): R|kotlin/String|
+
+    }
+    public final fun foo(wrappers: R|kotlin/collections/List<Wrapper>|): R|kotlin/collections/List<kotlin/String>| {
+        ^foo R|kotlin/collections/buildList|<R|kotlin/String|>(<L> = buildList@fun R|kotlin/collections/MutableList<kotlin/String>|.<anonymous>(): R|kotlin/Unit| <inline=Inline, kind=EXACTLY_ONCE>  {
+            R|<local>/wrappers|.R|kotlin/collections/mapTo|<R|Wrapper|, R|kotlin/String|, R|kotlin/collections/MutableList<kotlin/String>|>(this@R|special/anonymous|, <L> = mapTo@fun <anonymous>(it: R|Wrapper|): R|kotlin/String| <inline=Inline, kind=UNKNOWN>  {
+                ^ R|<local>/it|.R|/Wrapper.tag|
+            }
+            )
+        }
+        )
+    }

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/problems/buildList.kt

@@ -0,0 +1,5 @@
+class Wrapper(val tag: String)
+
+fun foo(wrappers: List<Wrapper>) = buildList {
+    wrappers.mapTo(this) { it.tag }
+}