[aarch64-port-dev ] Update enum Family CPU_Xxx for aarch64 from ISO8859-1 (ASCII) representation to HEX

[Yangfei (Felix)]

Patch02 looks better.  But it's meaningless to keep the charater "'脌'" in the comment.  

Thanks,
Felix

> 
> Hi
> 
> Here is a quick question about a change upon the "enum Family" defined in
> hotspot/cpu/aarch64/vm_version_aarch64.hpp.
> 
> I want to add CPU_AMPERE (0xC0) into the enum; however it is not an "ASCII
> printable character" like others, instead it belongs to the list of "The extended
> ASCII codes"[2]. A simple patch [3] adding 'À' simply would cause many
> "multichar" warnings when making, while using HEX directly [4] for this item only
> will bring an 'inconsistency' into of the overall definition of this enum, the last
> choice is to use Hex representation for all [5]. It can be safe and better for future
> new IDs if any; however I know it looks bringing a potential impact to all aarch64
> 'buddies'.
> 
> Thanks for any advice.
> 
> I don't want to add below option in makefiles to suppress warnings as it might be
> helpful to detect real typos in future.
> -Wno-multichar
> Do not warn if a multicharacter constant (''FOOF'') is used. Usually they indicate a
> typo in the user's code, as they have implementation-defined values, and should
> not be used in portable code.
> 
> [1] https://static.docs.arm.com/ddi0487/da/DDI0487D_a_armv8_arm.pdf, page
> 5945.
> [2] https://www.ascii-code.com/
> [3] http://cr.openjdk.java.net/~qpzhang/cpu_ampere/patch01.diff, use 'À'
> [4] http://cr.openjdk.java.net/~qpzhang/cpu_ampere/patch02.diff, use 0xC0
> [5] http://cr.openjdk.java.net/~qpzhang/cpu_ampere/patch03.diff, use Hex
> representation for all
> 
> FYI.
> 
> Hex representation ISO8859-1 representation Implementer
> 0x0 NUL Reserved for software use
> 0xc0 À Ampere Computing
> 0x41 A ARM Limited
> 0x42 B Broadcom Corporation
> 0x43 C Cavium Inc.
> 0x44 D Digital Equipment Corporation
> 0x49 I Infineon Technologies AG
> 0x4D M Motorola or Freescale Semiconductor Inc.
> 0x4E N NVIDIA Corporation
> 0x50 P Applied Micro Circuits Corporation
> 0x51 Q Qualcomm Inc.
> 0x56 V Marvell International Ltd.
> 0x69 i Intel Corporation
> 
> Regards
> Patrick