message: fix(compiler-cli): use forward slashes for ts.resolveModuleName
  Windows paths have back slashes, but TypeScript expects to always have forward slashes.
  In other places where this call happens (like `src/compiler_host.ts`) the same fix is present.
  PR Close
diff: @@ -61,8 +61,8 @@ class CompilerHostMixin {
  containingFile = path.join(this.basePath, 'index.ts');
  }
  const resolved = ts.resolveModuleName(
  - m, containingFile, this.options, this.moduleResolutionHost,
  - this.moduleResolutionCache)
  + m, containingFile.replace(/\\/g, '/'), this.options,
  + this.moduleResolutionHost, this.moduleResolutionCache)
  .resolvedModule;
  if (resolved) {
  if (this.options.traceResolution) {
  