Fix several operations in the parser that rewrite constant expressions
to preserve knowledge regarding whether a value originally contained a ".".
This information is required to accurately validate Asm.js typing.

Making the assumption that if either side of a binary operation contains
a dot, that the rewritten expression should be treated as a double for
Asm.js purposes. This is a slight deviation from the spec (which
would forbid mix type operations).

BUG= https://code.google.com/p/v8/issues/detail?id=4203
TEST=test-asm-validator, test-parsing
R=titzer@chromium.org,marja@chromium.org,aseemgarg@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1492123002

Cr-Commit-Position: refs/heads/master@{#32581}