Use references to get the HIR::Literal on HIR::LiteralExpr's

[philberty]

When we have a data structure containing fields we should use references where possible:

This helper should simply return a reference:

gccrs/gcc/rust/hir/tree/rust-hir-expr.h

Line 97 in fdcad08

Literal *get_literal () { return &literal; }

To fix this change this helper to return the fat-pointer and fix up the build after that.

[mvvsmk]

Hey, @philberty I was going through the code and you have actually solved this issue in pull request #860 . XD

[philberty]

Thanks, @mvvsmk for pointing that out! Closing this issue now.