cgen: `unknown type name` for a reference to an alias of a fixed array of struct

[rilaaax]

Describe the bug

When compiling with -g flag, C compilation fails when using a reference to an alias of a fixed array of struct.

No errors without the flag.

Reproduction Steps

type Palette = [4]Color

enum Color {
	red
	green
	blue
}

struct Box {
	p &Palette
}

fn main() {
	box := Box{
		p: unsafe { nil }
	}
	println(box)
}

Expected Behavior

success

Current Behavior

 error: unknown type name 'main__Palette'
 1556 |         main__Palette* p;
      |         ^
1 error generated.

Possible Solution

No response

Additional Information/Context

No response

V version

0.5.2 a5a89d5

Environment details (OS name and version, etc.)

V full version	V 0.5.2 76f77e3.a5a89d5
OS	macos, macOS, 27.0, 26A5388g
V git status	0.5.2-210-ga5a89d56
cc version	Apple clang version 21.0.0 (clang-2100.1.1.101)
gcc version	Apple clang version 21.0.0 (clang-2100.1.1.101)
clang version	Apple clang version 21.0.0 (clang-2100.1.1.101)
tcc version	tcc version 0.9.28rc 2026-07-24 HEAD@85ba3ae8 (AArch64 Darwin)
tcc git status	thirdparty-macos-arm64 274abd24
emcc version	N/A
glibc version	N/A

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