[clang-tools-extra] [clang-tidy] Add a new check 'replace-with-string-view' (PR #172170)

[Baranov Victor via cfe-commits]

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@@ -0,0 +1,171 @@
+// RUN: %check_clang_tidy -std=c++17-or-later %s performance-replace-with-string-view %t -- -- -I %S/Inputs
+
+namespace std {
+  template <typename CharT>
+  class basic_string_view {
+  public:
+    basic_string_view(const CharT *);
+    basic_string_view();
+  };
+  using string_view = basic_string_view<char>;
+  using wstring_view = basic_string_view<wchar_t>;
+  using u16string_view = basic_string_view<char16_t>;
+
+  template <typename CharT>
+  class basic_string {
+  public:
+    basic_string();
+    basic_string(const CharT *);
+    basic_string(basic_string_view<CharT>);
+
+    basic_string operator+(const basic_string &) const;
+  };
+  using string = basic_string<char>;
+  using wstring = basic_string<wchar_t>;
+  using u16string = basic_string<char16_t>;
+}
+
+// ==========================================================
+// Positive tests
+// ==========================================================
+
+std::string simpleLiteral() {
+// CHECK-MESSAGES:[[@LINE-1]]:1: {{.*}}[performance-replace-with-string-view]{{.*}}
+// CHECK-FIXES: std::string_view{{.*}}
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vbvictor wrote:

Please match full lines also in fixes

https://github.com/llvm/llvm-project/pull/172170