port 18b9c1ce (r34461)

  original commit message:
  Per ProxyCreate() (https://tc39.github.io/ecma262/#sec-proxycreate), a Proxy
  is only given a [[Call]] slot if the target has a [[Call]] slot as well. This
  was previously implemented correctly for [[Construct]], but not for [[Call]].

BUG=

Review URL: https://codereview.chromium.org/1754593007

Cr-Commit-Position: refs/heads/master@{#34478}