[llvm] [llvm-(min-)tblgen] Avoid redundant source compilation (PR #114494)

[NAKAMURA Takumi via llvm-commits]

chapuni wrote:

I don't have strong opinions of this. I misunderstood this as reduction of duplications.

I think this is the issue in ccache. That said, I don't think I should stop this.
Please wait for other opinions.

https://github.com/llvm/llvm-project/pull/114494