[clang-tools-extra] [clang-tidy] Add `performance-explicit-move-constructor` check (PR #122599)

[Piotr Zegar via cfe-commits]

================
@@ -0,0 +1,34 @@
+// RUN: %check_clang_tidy %s performance-explicit-move-constructor %t
+
+class NotReported1 {};
+
+class NotReported2 {
+public:
+  NotReported2(NotReported2&&) = default;
+  NotReported2(const NotReported2&) = default;
+};
+
+class NotReported3 {
+public:
+  explicit NotReported3(NotReported3&&) = default;
+};
+
+class NotReported4 {
+public:
+  explicit NotReported4(NotReported4&&) = default;
+  NotReported4(const NotReported4&) = delete;
+};
+
+class NotReported5 {
+public:
+  explicit NotReported5(NotReported5&&) = delete;
+  NotReported5(const NotReported5&) = default;
+};
+
+class Reported {
+public:
+  explicit Reported(Reported&&) = default;
+  // CHECK-MESSAGES: :[[@LINE-1]]:12: warning: copy constructor may be called instead of move constructor [performance-explicit-move-constructor]
+  // CHECK-FIXES: {{^  }}Reported(Reported&&) = default;{{$}}
+  Reported(const Reported&) = default;
+};
----------------
PiotrZSL wrote:

test with inherited constructors and with template classes

https://github.com/llvm/llvm-project/pull/122599