[PATCH] Add AMD znver5 processor support

[Nick Clifton]

Hi Jan, Hi Joshi,

   Two new failures in the gas testsuite for PE based x86_64
   toolchains has just appeared:

FAIL: x86-64 arch 5
FAIL: x86-64 arch 5 (znver5)

   It looks like a simple regexp problem:

regexp_diff match failure
regexp "^[ 	]*[a-f0-9]+:[ 	]*0f 18 3d 78 56 34 12[ 	]*prefetchit0 0x12345678\(%rip\)        # 0x[0-9a-f]+$"
line   "  15:	0f 18 3d 78 56 34 12 	prefetchit0 0x12345678(%rip)        # 12345694 <.text+0x12345694>"

   Could you take a look please ?

Cheers
   Nick

PS.  Seen with toolchains configured as x86_64-pc-cygwin,
   x86_64-pc-mingw64 and x86_64-w64-mingw32