Define op tables once as static variables

[gonzus]

This way we avoid declaring and initializing these tables every time we are parsing one of the corresponding ops.

This is my first pull request to this project. Apologies if I missed something.

[gonzus]

Hum... This is weird. I see the build jobs failing with this error:

src/parser.cpp:2318:1: sorry, unimplemented: non-trivial designated initializers not supported

And yet on my mac laptop it compiles fine with these options: c++ -std=c++11 -Wall. My compiler is:

$ c++ --version
Apple LLVM version 10.0.1 (clang-1001.0.46.3)
Target: x86_64-apple-darwin18.5.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

I believe this patch is worthwhile because it should give zig a bit more speed while parsing operators. Maybe we are using an older version of C++?

[andrewrk]

Congrats on your first PR. Unfortunately for stage1 it's important to keep things working with a wide range of compilers.

Can I suggest that you look for issues labeled "contributor friendly"?

Another thing you can do is start working on a project in Zig, and then if you run into bugs or other issues, file high quality issue reports, and then look into solving them.