Ignore run-pass/sse2 when using system LLVM

This is a test of `target_feature`, which needs a rust-specific patch to
LLVM to add `MCSubtargetInfo::getFeatureTable()`.

Gbp-Pq: Name u-0001-Ignore-run-pass-sse2-when-using-system-LLVM.patch

u-reproducible-build

Gbp-Pq: Name u-reproducible-build.patch

u-gperf-3.1

Gbp-Pq: Name u-gperf-3.1.patch

u-powerpcspe-support

Gbp-Pq: Name u-powerpcspe-support.patch

u-fix-sparc64-cabi

Gbp-Pq: Name u-fix-sparc64-cabi.patch

u-sparc64-detection

Gbp-Pq: Name u-sparc64-detection.patch

rustc (1.24.1+dfsg1-1) unstable; urgency=medium

  * Upload to unstable.
  * Raise allowed-test-failures to 160 on some non-release arches: powerpc,
    powerpcspe, sparc64, x32.

[dgit import unpatched rustc 1.24.1+dfsg1-1]

Import rustc_1.24.1+dfsg1-1.debian.tar.xz

[dgit import tarball rustc 1.24.1+dfsg1-1 rustc_1.24.1+dfsg1-1.debian.tar.xz]

Import rustc_1.24.1+dfsg1.orig.tar.xz

[dgit import orig rustc_1.24.1+dfsg1.orig.tar.xz]