[Bug 1859404] Re: binutils regressed llvm-toolchain-9 and llvm-toolchain-7 bootstrap on arm64

[Gianfranco Costamagna]

golang-1.13 has a really similar issue

##### ../misc/cgo/testshared
shared_test.go:72: executing go install -installsuffix=5577006791947779410 -buildmode=shared runtime sync/atomic failed exit status 2:
# /tmp/go-build097387848/b009/libruntime,sync-atomic.so
/<<PKGBUILDDIR>>/pkg/tool/linux_arm64/link: running gcc failed: exit status 1
collect2: fatal error: ld terminated with signal 4 [Illegal instruction], core dumped
compilation terminated.

FAIL	misc/cgo/testshared	6.272s
FAIL
2020/01/13 08:41:33 Failed: exit status 1

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https://bugs.launchpad.net/bugs/1859404

Title:
  binutils regressed llvm-toolchain-9 and llvm-toolchain-7 bootstrap on
  arm64

Status in binutils package in Ubuntu:
  New

Bug description:
  Retrying builds on bileto with the release only pocket enabled worked
  correctly.

  
  Still trying to figure out what can have regressed it (Debian doesn't show the issue, but probably it is affected on the same way, just his CPUs can understand the new instructions?

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