[xla:cpu] Add support for emitting host kernels for fusions
[xla:cpu] Add support for emitting host kernels for fusions

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13018 from ROCm:ci_amdtags_20240523 0bf9ab80d06284883df19f17f421eb6a691c0dd8
