Windows Arm64 release build fails

[zooba]

There appears to be a compiler bug that causes build failures with optimization enabled when targeting ARM64 on Windows:

        D:\a\1\s\Objects\unicodetype_db.h(4363): fatal error C1002: compiler is out of heap space in pass 2 [D:\a\1\s\PCbuild\pythoncore.vcxproj]

It repros reliably with cl /c /O2 Objects\unicodectype.c (with include dirs added), so I reported it to the C++ compiler team.

In the mean time, we'll disable optimizations for that file on ARM64 and hopefully that will get us through releases. Unless someone figures out a way to restructure the generated header to make the compiler happier, this is probably all we can do until the bug is fixed.

Linked PRs

• gh-153668: Temporarily disable unicodectype.c optimization on WinARM64 due to compiler bug #153669

[zooba]

Turns out (after more testing) that PGO builds are unaffected, which means we won't have a problem releasing. It also doesn't affect 3.14 (or earlier, I assume), so I can target the fix more specifically.