x86 backend: support all the frontend features

[andrewrk]

zig/src/target.zig

Lines 521 to 528 in 19b6995

	.panic_fn => ofmt == .c or use_llvm or cpu_arch == .x86_64,
	.panic_unwrap_error => ofmt == .c or use_llvm,
	.safety_check_formatted => ofmt == .c or use_llvm,
	.error_return_trace => use_llvm,
	.is_named_enum_value => use_llvm,
	.error_set_has_value => use_llvm or cpu_arch.isWasm(),
	.field_reordering => use_llvm,
	.safety_checked_instructions => use_llvm,

[jacobly0]

Split into #21529 and #21530

[nektro]

was the former issue linked meant to be the same as this one?
edit: was it meant to be #22257 ?