[CodeComplete] Properly determine qualifiers of 'this' in a lambda

Summary:
The clang used to pick up the qualifiers of the lamba's call operator
(which is always const) and fail to show non-const methods of 'this' in
completion results.

Reviewers: kadircet

Reviewed By: kadircet

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D55885

llvm-svn: 349655
diff --git a/clang/test/CodeCompletion/this-quals.cpp b/clang/test/CodeCompletion/this-quals.cpp
new file mode 100644
index 0000000..eeaed00
--- /dev/null
+++ b/clang/test/CodeCompletion/this-quals.cpp
@@ -0,0 +1,21 @@
+class foo {
+  void mut_func() {
+    [this]() {
+
+    }();
+    // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:4:1 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+    // CHECK-CC1: const_func
+    // CHECK-CC1: mut_func
+  }
+
+  void const_func() const {
+    [this]() {
+
+    }();
+    // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:13:1 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
+    // CHECK-CC2-NOT: mut_func
+    // CHECK-CC2: const_func
+  };
+};
+
+