[M] Change in coreboot[master]: arch/x86/include/arch: fix assembly clobber for 64bit

[Matei Dibu (Code Review)]

Attention is currently required from: Matei Dibu, Nico Huber.

Hello build bot (Jenkins), Nico Huber, Angel Pons, Arthur Heymans, Elyes Haouas,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/66345

to look at the new patch set (#9).

Change subject: arch/x86/include/arch: fix assembly clobber for 64bit
......................................................................

arch/x86/include/arch: fix assembly clobber for 64bit

the "x86 PIC code ebx" workaround done previously
by commit 689e31d18b0 (Make cpuid functions usable
when compiled with PIC) does not work for x86_64
(the upper dword of rbx is set to 0)

the GCC bug that needed the workaround was fixed
in version 5 (see GCC bug 54232)

Change-Id: Iff1dd72c7423a3b385a000457bcd065cf7ed6b95
Signed-off-by: Matei Dibu 
---
M src/arch/x86/include/arch/cpuid.h
1 file changed, 46 insertions(+), 44 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/45/66345/9