[llvm] [LLVM] Change `Intrinsic::getBaseName` to return `std::string` (PR #111613)

[Matt Arsenault via llvm-commits]

arsenm wrote:

I would think avoiding std::string allocations is more important than reducing the size of the intrinsic name table. What is the compile time impact of this? 

https://github.com/llvm/llvm-project/pull/111613