[AArch64] It should be possible to see the system register encoding for named system registers

[bdash]

What is the feature you'd like to have? Accesses to system registers are represented as intrinsics that take an enum operand. This enum type's members are named with the system register names. In some contexts it can be useful to see the underlying encoded form of the system register (e.g., S2_1_c8_c2_5). Currently you can see only the name or the enum member's integer value (e.g., 0x8c15).

Additional Information: The first place that comes to mind to display this is as a tooltip on the enum members, but there may be other or better options.