Stack overflow while compiling `gleam` crate

[staktrace]

A number of people have run into a stack overflow in rustc when compiling the gleam crate, see servo/gleam#180 - I can reproduce this in a relatively controlled environment on Mozilla's macOS automation. Here is a log attempting to compile wrench which is dependent on gleam using rustc 1.32.0 which shows the error at the bottom.

This might be the same as #55779 although this seems specific to macOS so might be different.

[wirelyre]

This seems to be related to a large #[derive(Clone)] struct from gl_generator. Reduced test case.

[wirelyre]

I cannot reproduce the compiler stack overflow on beta or nightly (2019-02-02).