Assertion hit in clang::QualType::getCommonPtr()

[daurnimator]

When passed to zig translate-c, the following C snippet (from /lib/modules/5.3.11-arch1-1/build/arch/x86/include/asm/apic.h) hits an assertion

extern enum apic_intr_mode_id apic_intr_mode;
enum apic_intr_mode_id {
	APIC_PIC,
};

zig: /usr/include/clang/AST/Type.h:659: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed.

[daurnimator]

That fixed it for self-hosted translate-c, but this issue still exists until #3973 is merged.