clang + lld

• Rolled back to llvm-8.0.1
• Increased stack size (via -z stack-size= linker flag) to 256k

The previous version would blow up and trash the stack on certain inputs, took me a while to figure that out 😭

clang + lld end-to-end works!

Full path from C++ -> wasm!

* separate out getInstance, getModule, readFile
* App constructor takes module instead of filename
* Missing mem.check in MemFS.addFile

clang+lld

clang and lld compiled with binji/wasi-sdk-bin compiler toolchain.