Building core on thumbv6-none-eabi fails with "LLVM ERROR: invalid symbol redefinition"

[archshift]

In my project I'm using xargo to build libcore.

Perhaps appropriately, the compiler warns it may crash and then promptly crashes:

warning: the feature `const_generics` is incomplete and may cause the compiler to crash
  --> /home/gui/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/lib.rs:77:37
   |
77 | #![cfg_attr(not(bootstrap), feature(const_generics))]
   |                                     ^^^^^^^^^^^^^^

LLVM ERROR: invalid symbol redefinition

[archshift]

Tried the July 1st nightly, and it works fine.

[nikic]

Closing this in favor of #62932, which is the same issue (not related to const generics).