refactor(compiler): remove all source-level traces to tsc-wrapped (#18966)

- temporarily keeps the old sources under packages/tsc-wrapped
  until the build scripts are changed to use compiler-cli everywhere.
- removes the compiler options `disableTransformerPipeline` that was introduced
  in a previous beta of Angular 5, i.e. the transformer based compiler
  is now always enabled.

PR Close #18966

tools/build/linknodemodules.js

@@ -1,67 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-var fs = require('fs');
-var path = require('path');
-
-module.exports = function(gulp, plugins, config) {
-  function symlink(relativeFolder, linkDir) {
-    var sourceDir = path.join('..', relativeFolder);
-    if (!fs.existsSync(linkDir)) {
-      console.log('creating link', linkDir, sourceDir);
-      try {
-        fs.symlinkSync(sourceDir, linkDir, 'dir');
-      } catch (e) {
-        var sourceDir = path.join(config.dir, relativeFolder);
-        console.log('linking failed: trying to hard copy', linkDir, sourceDir);
-        copyRecursiveSync(sourceDir, linkDir);
-      }
-    }
-  }
-
-  return function() {
-    var nodeModulesDir = path.join(config.dir, 'node_modules');
-    if (!fs.existsSync(nodeModulesDir)) {
-      fs.mkdirSync(nodeModulesDir);
-    }
-    getSubdirs(config.dir).forEach(function(relativeFolder) {
-      if (relativeFolder === 'node_modules') {
-        return;
-      }
-
-      var linkDir = path.join(nodeModulesDir, relativeFolder);
-      symlink(relativeFolder, linkDir);
-    });
-    // Also symlink tools we release independently to NPM, so tests can require metadata, etc.
-    symlink('../../tools/metadata', path.join(nodeModulesDir, 'tsc-wrapped'));
-  };
-};
-
-function copyRecursiveSync(src, dest) {
-  if (fs.existsSync(src)) {
-    var stats = fs.statSync(src);
-    if (stats.isDirectory()) {
-      fs.mkdirSync(dest);
-      fs.readdirSync(src).forEach(function(childItemName) {
-        copyRecursiveSync(path.join(src, childItemName), path.join(dest, childItemName));
-      });
-    } else {
-      fs.writeFileSync(dest, fs.readFileSync(src));
-    }
-  }
-}
-
-function getSubdirs(rootDir) {
-  return fs.readdirSync(rootDir).filter(function(file) {
-    if (file[0] === '.') {
-      return false;
-    }
-    var dirPath = path.join(rootDir, file);
-    return fs.statSync(dirPath).isDirectory();
-  });
-}