Debug: Add support for 32-bit on 32-bit under GDB

[mikebeaton]

In addition to existing support for 32-bit on 64-bit

[mikebeaton]

@vit9696 If not for your comments by PM last night, I would have thought it was more or less obvious that the natural implementation would be that CPU_ARCH follows EFI_ARCH, but can be overridden. But I've implemented that CPU_ARCH is always X64 by default (regardless of EFI_ARCH), but can be overridden. Sounds like that may be what more users want to run, and has the (dubious?!) advantage of remaining compatible with how the script is currently called.

I've also changed from Ia32 to IA32 as the canonical arch name (matching changes elsewhere), but have added a small amount of code to keep compatibility with Ia32 value, for the same (dubious?) reason added support for IA32 (still normalised to Ia32 as the canonical and subdirectory name), since that matches the ARCH name passed in shell vars to EDK/OVMF/OC build scripts.

[mikebeaton]

Apologies - directory names need updating for change from Ia32 to IA32 (and will prevent it working on case sensitive FS like Unix until changed) - will fix this eve.

[mikebeaton]

Sorry, running commentary, I've switched back to Ia32 as the canonical name, but now allowing IA32 as well (normalised to Ia32 in the script), e.g. same as target arch spec for EDK and OC build scripts.

[mikebeaton]

Checked working in Linux (gdb 32/32, gdb 32/64, lldb 64/64) and macOS (gdb 32/32, gdb 32/64, lldb 64/64).

[vit9696]

Looks good to me, merged, tyvm!