[clang-tools-extra] [clang-tidy] make `misc-const-correctness` work with `auto` variables and lambdas (PR #157319)

[Victor Chernyakin via cfe-commits]

================
@@ -10,6 +10,12 @@ template <typename T>
 void type_dependent_variables() {
   T value = 42;
   auto &ref = value;
+  // CHECK-MESSAGES:[[@LINE-1]]:3: warning: variable 'ref' of type 'int &' can be declared 'const'
+  // CHECK-FIXES: auto  const&ref = value;
----------------
localspook wrote:

It actually produces this formatting, yep. Here it is on an existing test for example:

https://github.com/llvm/llvm-project/blob/ac60477295ef6c3683dd862984a7fcedb1a352d9/clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-values.cpp#L840-L842

https://github.com/llvm/llvm-project/pull/157319