clover: Call clang with -O0 for the SPIR-V path

SPIRV-LLVM-Translator isn't really built for handling optimized LLVM IR.
It tends to fall over when, for instance, an optimization generates an
i96 type which isn't legal in SPIR-V.  Pass -O0 to avoid these cases.
See https://github.com/KhronosGroup/SPIRV-LLVM-Translator/issues/203.

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6432>
1 file changed