[clang] [clang-tools-extra] [clang-tidy] Add new check `modernize-use-designated-initializers` (PR #80541)

[Julian Schmidt via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/80541 at github.com>


5chmidti wrote:

You can stream the `InitExpr->getSourceRange()` into the diagnostics, which would highlight the specific expression that needs a designated initializer.
E.g.:
```
use-designated-initializers.cpp.tmp.cpp:33:17: warning: use designated init expression [modernize-use-designated-initializers]
   33 | S2 s25 = {.i=1, 200};
      |                 ^~~
      |                 .j=
```
instead of 
```
use-designated-initializers.cpp.tmp.cpp:33:17: warning: use designated init expression [modernize-use-designated-initializers]
   33 | S2 s25 = {.i=1, 200};
      |                 ^
      |                 .j=
```

https://github.com/llvm/llvm-project/pull/80541