1. Asc command supported absolute path.

[LiaoPeng]

Got the below errors, when executed command asc /Workspace/assemblyscript/tests/compiler/for.ts -t for.wast

The reason is that the asc command works improperly when using absolute path.

 asc /Workspace/assemblyscript/tests/compiler/for.ts -t for.wast
ERROR: Entry file '/Workspace/assemblyscript/tests/compiler/for.ts' not found.
    at Object.main (/Users/peng/Workspace/assemblyscript/cli/asc.js:391:25)
    at Object.<anonymous> (/Users/peng/Workspace/assemblyscript/bin/asc:21:26)
    at Module._compile (internal/modules/cjs/loader.js:774:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:785:10)
    at Module.load (internal/modules/cjs/loader.js:641:32)
    at Function.Module._load (internal/modules/cjs/loader.js:556:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:837:10)
    at internal/main/run_main_module.js:17:11

[dcodeIO]

This somehow feels like half a fix for paths inside baseDir only. Or does it work for other absolute paths outside baseDir properly already?

[LiaoPeng]

I missed this test case. Now I fixed it.

What do you think the way to change implementation of readFileNode like this?

function readFileNode(filename, baseDir) {
    try {
      let text;
      stats.readCount++;
      stats.readTime += measure(() => {
        let filePath = path.isAbsolute(filename) ? filename :  path.join(baseDir, filename);
        text = fs.readFileSync(filePath , { encoding: "utf8" });
      });
      return text;
    } catch (e) {
      return null;
    }
  }

[dcodeIO]

Thanks!