Bugzilla

I do get this beauty when compiling firefox-88.0_beta3 for arm:

```
 2:00.25 error[E0432]: unresolved imports `core::arch::arm::vcvtq_s32_f32`, `core::arch::arm::vgetq_lane_s32`, `core::arch::arm::vld1q_dup_f32`, `core::arch::arm::vld1q_f32`, `core::arch::arm::vmaxq_f32`, `core::arch::arm::vminq_f32`
 2:00.25   --> gfx/qcms/src/transform_neon.rs:9:40
 2:00.25    |
 2:00.25 9  |     float32x4_t, int32x4_t, vaddq_f32, vcvtq_s32_f32, vgetq_lane_s32, vld1q_dup_f32, vld1q_f32,
 2:00.25    |                                        ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^^ no `vld1q_f32` in `arch::arm`
 2:00.25    |                                        |              |               |
 2:00.25    |                                        |              |               no `vld1q_dup_f32` in `arch::arm`
 2:00.25    |                                        |              no `vgetq_lane_s32` in `arch::arm`
 2:00.25    |                                        no `vcvtq_s32_f32` in `arch::arm`
 2:00.25 10 |     vmaxq_f32, vminq_f32, vmulq_f32,
 2:00.25    |     ^^^^^^^^^  ^^^^^^^^^ no `vminq_f32` in `arch::arm`
 2:00.25    |     |
--
 2:00.26    |     ^^^^^^^^^
 2:00.26 help: a similar name exists in the module
 2:00.26    |
 2:00.26 10 |     vmaxq_f32, vmvnq_s32, vmulq_f32,
 2:00.26    |                ^^^^^^^^^
```

I came here through the gecko-dev blame function - does your patch here raise minimal rust to rust-1.50.0 then? If so, please confirm so I can upgrade the toolchain - and please bump the config scripts accordingly to ask for propper rust version. Thank you :)