Method add_ext

crates/rustc_codegen_spirv/src/builder_spirv.rs:430–435

(builder: &mut Builder, enabled_extensions: &mut FxHashSet<Symbol>, ext: Symbol)

            enabled_capabilities.insert(cap);
        }
        fn add_ext(builder: &mut Builder, enabled_extensions: &mut FxHashSet<Symbol>, ext: Symbol) {
            // This should be the only callsite of Builder::extension (aside from tests), to make
            // sure the hashset stays in sync.
            builder.extension(ext.as_str());
            enabled_extensions.insert(ext);
        }

        for feature in features {
            match *feature {