[clang-tools-extra] [Clang-Tidy] Add google-runtime-float Clang-Tidy check (PR #156763)

[via cfe-commits]

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+.. title:: clang-tidy - google-runtime-float
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+google-runtime-float
+====================
+
+Finds uses of ``long double`` and suggests against their use due to
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EugeneZelenko wrote:

Please synchronize with statement in Release Notes.

https://github.com/llvm/llvm-project/pull/156763