fix(@ngtools/webpack): remove default type checker memory limit

Seems to be causing trouble on Appveyor and we use the parent one anyway.

Author: filipesilva

packages/@ngtools/webpack/src/angular_compiler_plugin.ts

@@ -464,26 +464,14 @@ export class AngularCompilerPlugin implements Tapable {
       ? './type_checker_bootstrap.js'
       : './type_checker.js';
 
-    let hasMemoryFlag = false;
-    const memoryFlagRegex = /--max-old-space-size/;
     const debugArgRegex = /--inspect(?:-brk|-port)?|--debug(?:-brk|-port)/;
 
     const execArgv = process.execArgv.filter((arg) => {
-      // Check if memory is being set by parent process.
-      if (memoryFlagRegex.test(arg)) {
-        hasMemoryFlag = true;
-      }
-
       // Remove debug args.
       // Workaround for https://github.com/nodejs/node/issues/9435
       return !debugArgRegex.test(arg);
     });
 
-    if (!hasMemoryFlag) {
-      // Force max 8gb ram.
-      execArgv.push('--max-old-space-size=8192');
-    }
-
     const forkOptions: ForkOptions = { execArgv };
 
     this._typeCheckerProcess = fork(path.resolve(__dirname, typeCheckerFile), [], forkOptions);