It is not known by GCC13:
https://ci.debian.net/packages/h/halide/testing/i386/50047733/

and fails with
```
/usr/bin/g++ -DHALIDE_ENABLE_RTTI -DHALIDE_VERSION_MAJOR=18 -DHALIDE_VERSION_MINOR=0 -DHALIDE_VERSION_PATCH=0 -DHALIDE_WITH_EXCEPTIONS -isystem /usr/include/halide18 -O3 -DNDEBUG -MD -MT CMakeFiles/main.dir/main.cpp.o -MF CMakeFiles/main.dir/main.cpp.o.d -o CMakeFiles/main.dir/main.cpp.o -c /tmp/autopkgtest.pviDWM/build.Sjp/src/test/integration/jit/main.cpp
In file included from /tmp/autopkgtest.pviDWM/build.Sjp/src/test/integration/jit/main.cpp:1:
/usr/include/halide18/Halide.h: In member function ‘Halide::float16_t::operator _Float16() const’:
/usr/include/halide18/Halide.h:3054:40: error: SSE register return with SSE2 disabled
 3054 |     explicit operator _Float16() const {
      |                                        ^
/usr/include/halide18/Halide.h:3057:16: error: SSE register return with SSE2 disabled
 3057 |         return result;
      |                ^~~~~~
/usr/include/halide18/Halide.h: In constructor ‘Halide::Expr::Expr(_Float16)’:
/usr/include/halide18/Halide.h:4679:64: error: invalid conversion from type ‘_Float16’ without option ‘-msse2’
 4679 |         : IRHandle(Internal::FloatImm::make(Float(16), (double)x)) {
      |                                                                ^
ninja: build stopped: subcommand failed.

```
with GCC14.