[clang] [Clang] improve -Wstring-concatenation to warn on every missing comma in initializer lists (PR #154018)

[Oleksandr T. via cfe-commits]

a-tarasyuk wrote:

@ilovepi @nathanchance @AaronBallman I’ve opened a PR to roll back the changes 
for now, to finalize the intended behavior of this flag.

https://github.com/llvm/llvm-project/pull/154018
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