enums: init with const value with comp time $if

[esquerbatua]

Describe the bug

Can't initialice an enum with a const int value

Reproduction Steps

const enum_value = $if linux { 1 } $else { 2 }

pub enum Test {
	a = enum_value
}

fn main() {
	println(Test.a)
}

Expected Behavior

output:
1 if the build env is linux else 2

Current Behavior

/tmp/v_1000/break.tmp.c:884: error: '_const_main__enum_value' undeclared
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .
make: *** [Makefile:11: run] Error 1

Possible Solution

No response

Additional Information/Context

No response

V version

V full version: V 0.4.8 aa3ab3f.2f85036

Environment details (OS name and version, etc.)

V full version: V 0.4.8 aa3ab3f.2f85036
OS: linux, Ubuntu 24.04.1 LTS
Processor: 16 cpus, 64bit, little endian, AMD Ryzen 7 7840HS w/ Radeon 780M Graphics

vexe: /home/esquerbatua/git/v/v
vexe mtime: 2024-10-01 19:04:41

vroot: OK, value: /home/esquerbatua/git/v
VMODULES: OK, value: /home/esquerbatua/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.43.0
Git vroot status: 0.4.8-37-g2f850361-dirty
.git/config present: true

CC version: cc (Ubuntu 13.2.0-23ubuntu4) 13.2.0
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

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