6b96a7944a
Add `lp64e` RISC-V ABI This PR adds support for the `lp64e` RISC-V ABI, which is the 64-bit equivalent of the `ilp32e` ABI that is already supported. For reference, this ABI was originally added to LLVM in [this PR](https://reviews.llvm.org/D70401).
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.