[clang] [clang] add `-fimplicit-constexpr` flag (PR #136436)

[Aaron Ballman via cfe-commits]

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AaronBallman wrote:

> IMO this kind of flag requires an RFC.

+1, this sort of extension requires an RFC. Please be sure to mention how the RFC addresses our [usual criteria](https://clang.llvm.org/get_involved.html#criteria) for new extensions, too.

https://github.com/llvm/llvm-project/pull/136436