[DebugInfo] Update CodeView enums (#71038)

This adds the following values to the CodeView.h enums (and updates the
various functions that use them):


* CPUType:
  * Added `Unknown`
* This is not currently documented in the online documentation, but this
is present in `cvconst.h` in the latest DIA SDK (Visual Studio 2022,
17.7.6)
* `Unknown` is the CPUType that is emitted by `aliasobj.exe` in the
Compile3Sym records, and can be found in objects that link with
`oldnames.lib`
    

![image](https://github.com/llvm/llvm-project/assets/69168929/8ee7b032-761b-45da-8439-d07aba797940)


* SourceLanguage (All of these are documented at
https://learn.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/cv-cfl-lang?view=vs-2022
and are present in `cvconst.h` in the latest DIA SDK (Visual Studio
2022, 17.7.6))
  * Added Go
  * Added AliasObj
* emitted by `aliasobj.exe` in certain records, can be found in PDBs
that link with `oldnames.lib`
  * Changed Swift to the official Microso...