codegen-units setting in Cargo.toml causes LLVM error with nightly-i686-pc-windows-msvc

[Boscop]

Using the latest nightly rustc 1.13.0-nightly (cbe4de78e 2016-09-05) I'm getting this error on a project that uses euclid which uses xml-rs:
LLVM ERROR: assembler label 'L__ehtable$_ZN3xml6reader6parser10MarkupData13take_ encoding17hb15412b3bac19ec7E' can not be undefined error: Could not compile xml-rs.
This happens only when I have codegen-units = 4 in my Cargo.toml and only with the 32bit version of the toolchain, only with nightly-i686-pc-windows-msvc not with nightly-x86_64-pc-windows-msvc.
(I tested 4 configs: with/without codegen-units = 4 in Cargo.toml ⨯ 32/64 bit)

[brson]

cc @mw

[alexcrichton]

cc @michaelwoerister

[brson]

Nominating for @rust-lang/compiler triage.

[michaelwoerister]

I have a dim memory of fixing this exact same problem two months ago... 😕

[michaelwoerister]

I knew that I had seen this problem before somewhere: #33890 (comment)