Build failure on MSVC 1935 with JIT enabled

[mdboom]

Bug report

Bug description:

Building on MSVC 1935 currently fails when building with the JIT, because that compiler does not support empty array initializers ({}).

PCbuild\build.bat --experimental-jit -c Release

...

C:\actions-runner\_work\benchmarking\benchmarking\cpython\PCbuild\obj\314amd64_PGInstrument\pythoncore\jit_stencils.h(23145,68): error C2059: syntax error: '}' (compiling source file ..\Python\jit.c) [C:\actions-runner\_work\benchmarking\benchmarking\cpython\PCbuild\pythoncore.vcxproj]

This line in jit_stencils.h looks like:

static const StencilGroup trampoline = {emit_trampoline, 273, 24, {}};
                                                                   ^

This was introduced recently in #123872. All of the uses of empty initializers should use {0} instead.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

• gh-125207: Fix MSVC 1935 build with JIT #125209