Add line and col info to wast parser exceptions (#2570)
Add line and col info to wast parser exceptions (#2570)

This adds line and column info to wast parser exception messages to be
more readable when they are encoutered. In other cases this makes
existing line and column number more fine grained, or adds some helpful
strings (if line and column info is not available).
WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen