add example test

Author: charles-zablit

lldb/test/Shell/Swift/function-name-backtrace.test

@@ -0,0 +1,45 @@
+# XFAIL: target-windows
+
+# Test Swift function name printing in backtraces.
+
+# RUN: split-file %s %t
+# RUN: %target-swiftc -g %t/main.swift -o %t.out
+# RUN: %lldb -x -b -s %t/commands.input %t.out -o exit 2>&1 \
+# RUN:       | FileCheck %s
+
+#--- main.swift
+func foo() async -> Int {
+  let t = await try! bar(a: 1, b: 1)
+  var baz = Baz(baz: 1)
+  var qux = baz.qux(a: 1)
+  return qux(1)
+}
+
+var res = {
+    (index: Int) -> Int in
+    return index + 10
+}(1)
+
+fileprivate func bar(a: Int, b: Int) async throws -> Int {
+  return res + a + b
+}
+
+struct Baz {
+  var baz: Int
+  mutating func qux<T>(a: T) -> (Int) -> Int {
+    baz += 1
+    print(a)
+    return {$0 + 1}
+  }
+}
+
+await foo()
+
+#--- commands.input
+b qux
+
+run
+bt
+
+# CHECK: main`Baz.qux<Int>(a=1)
+# CHECK: main`foo()