don't use project scope to resolve java.lang.String (#KT-25024)

plugins/uast-kotlin/tests/KotlinDetachedUastTest.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.uast.test.kotlin
 
+import com.intellij.psi.PsiClassType
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiFile
 import com.intellij.psi.PsiLanguageInjectionHost
@@ -130,6 +131,19 @@ class KotlinDetachedUastTest : KotlinLightCodeInsightFixtureTestCase() {
 
     }
 
+    fun testResolveStringFromUast() {
+        val file = myFixture.addFileToProject(
+            "s.kt", """fun foo(){
+                val s = "abc"
+                s.toUpperCase()
+                }
+            ""${'"'}"""
+        )
+
+        val refs = file.findUElementByTextFromPsi<UQualifiedReferenceExpression>("s.toUpperCase()")
+        TestCase.assertNotNull((refs.receiver.getExpressionType() as PsiClassType).resolve())
+    }
+
 }
 
 fun <T> T?.orFail(msg: String): T = this ?: error(msg)