llvm.x86.vcvtps2ph.128 missing

[m4b]

I was directed to create an issue when compiling a particular example in iced_anim (the other examples I was build and trying out did not panic fwiw).

Simple repro (assumes cranelift + cargo all setup, etc.):

git clone https://github.com/bradysimon/iced_anim

cd iced_anim

cargo r --example animated_widgets

thread 'main' (180923) panicked at library/core/src/panicking.rs:225:5:
llvm.x86.vcvtps2ph.128 is not yet supported.
See https://github.com/rust-lang/rustc_codegen_cranelift/issues/171
Please open an issue at https://github.com/rust-lang/rustc_codegen_cranelift/issues
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread caused non-unwinding panic. aborting.
fish: Job 1, 'cargo r --example animated_widg…' terminated by signal SIGABRT (Abort)

ref #171

Great work btw, I recently started using it again, and I have subsecond incremental debug builds with it + wild on linux machines, for rather large project like iced application, very impressive!