Inlines the ToBoolean operations in the interpreter. Also do some
cleanup to unify UnaryOp helper in the Interpreter, remove the unused
BinaryOp Runtime call helper and remove extra newlines.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/1998593002
Cr-Commit-Position: refs/heads/master@{#36366}