Is there a way to influence code generator for type declarations?

[jxy]

`codegenDecl` only works with `var`, `let`, and `proc`. Is there a way to 
change how `type` section generates C code? I mainly want to generate object 
types in C that looks like
    
    
    struct sse_t { alignas(16) float sse_data[4];};
    
    
    Run

or
    
    
    typedef __attribute__((aligned(16))) float sse_t[4];
    
    
    Run