fix compilation error on 32-bit LLVM-enabled compiler builds
Fixes a regression introduced in
9295355985202c267b4326b5a6e2ad5158b48e5d that caused 32-bit builds with
`-Denable-llvm` to fail to build from source due to that common
u64/usize casting issue.
91b4729962Andrew Kelley committed on 4/30/2023, 7:14:02 PMparentab086b6