Bug#862360: llvm-toolchain-3.8: Fix R_AARCH64_MOVW_UABS_G3 relocation

[Edmund Grimley Evans]

Source: llvm-toolchain-3.8
Version: 1:3.8.1-23

Please apply this upstream bug fix to Debian's llvm-toolchain-3.8
before the release:

https://reviews.llvm.org/D27609?id=80860

See line 360 of RuntimeDyldELF.cpp.

The bug prevents julia from running on some arm64 systems and may
have other bad consequences:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861484

You could just change that one line:

-    *TargetPtr |= Result >> (48 - 5);
+    *TargetPtr |= (Result & 0xffff000000000000ULL) >> (48 - 5);

(Is there some way of searching for all such simple upstream bug fixes
that should perhaps be applied to Debian's llvm-toolchain-3.8?)