[llvm] [LLVM][Tablegen] Add Default arguments support for Intrinsics in TableGen (PR #198557)

[Rahul Joshi via llvm-commits]

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jurahul wrote:

If its int64_t, we can avoid the reinperpret_cast. And just use static_cast<> for the header.

https://github.com/llvm/llvm-project/pull/198557