Build stalls on massive autogenerated C files

I've been experimenting with building various things with emscripten to relatively decent success, until recently.

The library in question is [libpostal](https://github.com/openvenues/libpostal). After making a few changes (namely to have it use the clang webassembly SSE intrinsics, increasing the max wasm memory, etc), it hangs on building the enormous scanner.c - this file is autogenerated from re2c, but despite being enormous, non-emscripten builds take on the order of a few dozen seconds. Emscripten's build, however, steadily climbs in memory usage until its killed from OOM. I've thrown 200GB of memory at it and ran it overnight and it still never finished, eventually still dying to an OOM.

I can get the complexity of the file is quite high, but this still seems rather unusual, and I'm having trouble tracking down potential causes - I feel it may be a bug in the toolchain.