rustc/llvm segfault when compiling the float-cmp crate with -Ctarget-feature=sse2

[RazrFalcon]

Code

mikedilger/float-cmp@c28b1c8

Meta

rustc --version --verbose:

rustc 1.46.0 (04488afe3 2020-08-24)
binary: rustc
commit-hash: 04488afe34512aa4c33566eb16d8c912a3ae04f9
commit-date: 2020-08-24
host: x86_64-unknown-linux-gnu
release: 1.46.0
LLVM version: 10.0

Error output

> env RUSTFLAGS="-Ctarget-feature=sse2" cargo build --verbose --no-default-features --features std
   Compiling float-cmp v0.9.0-pre (/media/data/Downloads/float-cmp-master)
     Running `rustc --crate-name float_cmp --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="std"' -C metadata=e32f282109f55ef8 -C extra-filename=-e32f282109f55ef8 --out-dir /media/data/Downloads/float-cmp-master/target/debug/deps -C incremental=/media/data/Downloads/float-cmp-master/target/debug/incremental -L dependency=/media/data/Downloads/float-cmp-master/target/debug/deps -Ctarget-feature=sse2`
LLVM ERROR: Access past stack top!
error: could not compile `float-cmp`.

Caused by:
  process didn't exit successfully: `rustc --crate-name float_cmp --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="std"' -C metadata=e32f282109f55ef8 -C extra-filename=-e32f282109f55ef8 --out-dir /media/data/Downloads/float-cmp-master/target/debug/deps -C incremental=/media/data/Downloads/float-cmp-master/target/debug/incremental -L dependency=/media/data/Downloads/float-cmp-master/target/debug/deps -Ctarget-feature=sse2` (exit code: 101)

No backtrace.

Same error on rustc 1.48.0-nightly (d006f5734 2020-08-28)

-Ctarget-feature=sse2 or -Ctarget-feature=-sse2 produce an error. -Ctarget-feature=+sse2 is not.

No error on hello world app.

[mati865]

I think it's basically duplicate of #65844

[RazrFalcon]

Thanks. Wasn't able to find it via search.