[PATCH] Check for asm support in UI tests that require it

Add `needs-asm-support` compiletest directive, and use it in asm tests
that require asm support without relying on any architecture specific
features.

Gbp-Pq: Name u-84099.patch

[PATCH] Revert "Auto merge of #79547 - erikdesjardins:byval, r=nagisa"

This reverts commit a094ff9590b83c8f94d898f92c2964a5803ded06, reversing
changes made to d37afad0cc87bf709ad10c85319296ac53030f03.

See https://github.com/rust-lang/rust/issues/80810 for more background

Gbp-Pq: Name 0001-Revert-Auto-merge-of-79547.patch

[PATCH] differentiate functions in extern-compare-with-return-type.rs

Gbp-Pq: Name 9756838f612da2ef6c359aaea8bf0a69ad76716a.patch

[PATCH] bootstrap: Disable initial-exec TLS model on powerpc

Fixes #81334.

Gbp-Pq: Name u-85807.patch

rustc (1.50.0+dfsg1-1) unstable; urgency=medium

  * Upload to unstable.

[dgit import unpatched rustc 1.50.0+dfsg1-1]

Import rustc_1.50.0+dfsg1-1.debian.tar.xz

[dgit import tarball rustc 1.50.0+dfsg1-1 rustc_1.50.0+dfsg1-1.debian.tar.xz]

Import rustc_1.50.0+dfsg1.orig.tar.xz

[dgit import orig rustc_1.50.0+dfsg1.orig.tar.xz]