[CodeCompletion] Add tests for fixed cases

Just adding a test case since it's already fixed.

Until d78bf22, if there are multiple
brace statements in an ASTNode, only the first brace statement is
considered to be type checked.

rdar://problem/71001317

Author: rintaro

test/IDE/complete_multibracestmt.swift

@@ -0,0 +1,39 @@
+// RUN: %target-swift-ide-test -batch-code-completion -source-filename %s -filecheck %raw-FileCheck -completion-output-dir %t
+
+enum E {
+  case bar
+  case foo
+}
+
+func test(pred: Bool) {
+    var e: E
+    if pred {
+        e = .#^THEN?check=CHECK^#
+    } else {
+        e = .#^ELEE?check=CHECK^#
+    }
+
+    do {
+        e = .#^DO?check=CHECK^#
+    } catch e {
+        e = .#^CATCH?check=CHECK^#
+    }
+
+    switch pred {
+    case true:
+        e = .#^CASE_1?check=CHECK^#
+        break;
+    case false:
+        e = .#^CASE_2?check=CHECK^#
+        break;
+    default:
+        e = .#^DEFAULT?check=CHECK^#
+        break;
+    }
+}
+
+// CHECK: Begin completions, 3 items
+// CHECK: Decl[EnumElement]/ExprSpecific/TypeRelation[Identical]: bar[#E#]; name=bar
+// CHECK: Decl[EnumElement]/ExprSpecific/TypeRelation[Identical]: foo[#E#]; name=foo
+// CHECK: Decl[InstanceMethod]/CurrNominal/TypeRelation[Invalid]: hash({#(self): E#})[#(into: inout Hasher) -> Void#]; name=hash(self: E)
+// CHECK: End completions