[clang] [Clang] Instantiate constexpr function when they are needed. (PR #173537)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

@erichkeane @Sirraide I realized we have a `ExprConstShared.h` so I put a 
function with the `!FD->isDefined() && FD->isImplicitlyInstantiable() && 
FD->isConstexpr()` in there

https://github.com/llvm/llvm-project/pull/173537
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