v2026.4 regression: using of sizeof() operator in static const definition leads to compiler crash

[kachkov98]

Issue Description

After updating slangc from 2026.3.1 to 2026.4 the code with sizeof() in static const defintion doesn't compile anymore.

Reproducer Code

test.slang:

typedef uint MsgTy;
static const uint msgLen = sizeof(MsgTy);

old behavior:

> slangc.exe -v
2026.3.1
> slangc.exe test.slang -o test.slang-module -lang slang -std 2026
# builds successfully

new behavior:

> slangc.exe -v
2026.4
> slangc.exe test.slang -o test.slang-module -lang slang -std 2026
# test.slang-module is not produced, returned exit code 1