Allow eval and arguments as property names

Allow eval and arguments as property names

We incorrectly disallowed eval and arguments in accessor and method
names. This was because we checked the name inside the
ParseFunctionLiteral. We now flag accessors so that lazy parsing of
these functions are treated correctly.

BUG=v8:1984
R=adamk, dslomov@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/899363002

Cr-Commit-Position: refs/heads/master@{#26497}