[FIR-TEST] Add new testdata generated after changes in previous commit

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

@@ -0,0 +1,40 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+infix fun Any?.foo(a: Any) {}
+operator fun Any?.contains(a: Any): Boolean = true
+
+fun test(a: Any) {
+
+    a foo""
+    a foo"asd"
+    a foo"$a"
+    a foo"asd${a}sfsa"
+    a foo"""sdf"""
+    a foo'd'
+    a foo<!INFERENCE_ERROR!>''<!>
+
+    a foo""foo a
+    a foo"asd"foo a
+    a foo"$a"foo a
+    a foo"asd${a}sfsa"foo a
+    a foo"""sdf"""foo a
+    a foo'd'foo a
+    a foo<!INFERENCE_ERROR!>''<!>foo a
+
+    a in"foo"
+    a in"""foo"""
+    a in's'
+    a in<!INFERENCE_ERROR!>''<!>
+
+    a !in"foo"
+    a !in"""foo"""
+    a !in's'
+    a !in<!INFERENCE_ERROR!>''<!>
+
+    if("s"is Any) {}
+    if("s"is Any) {}
+    test("s"as Any)
+
+    a foo""<!SYNTAX!>1<!>
+    a foo""<!SYNTAX!>1.0<!>
+}