Now we can reuse the table between CPU model parsers on Linux and
Windows.
Use similar parsing structure for Windows as we do for Linux. On
Windows, we rely on two entries in the registry per CPU core:
`CP 4000` and `Identifier`. Collating the data from the two allows
us recreating most of the `/proc/cpuinfo` data natively on Windows.
Additionally, we still allow for overwriting any CPU features as flagged
by pulling the feature data embedded in `SharedUserData`.
Rename all references of sparcv9 to sparc64, to make Zig align more with
other projects. Also, added new function to convert glibc arch name to Zig
arch name, since it refers to the architecture as sparcv9.
This is based on the suggestion by @kubkon in PR 11847.
(https://github.com/ziglang/zig/pull/11487#pullrequestreview-963761757)
