PPC: [date] Refactor the %_DateField intrinsic to be optimizable.

PPC: [date] Refactor the %_DateField intrinsic to be optimizable.

Port e4782a9b468258344d512a5f7dadbf1584928849

Original commit message:
Previously the %_DateField intrinsic would also check the object and
throw an exception if you happen to pass something that is not a valid
JSDate, which (a) violates our policy for instrinsics and (b) is hard to
optimize in TurboFan (even Crankshaft has a hard time, but there we will
never inline the relevant builtins, so it doesn't show up). The throwing
part is now a separate intrinsics %_ThrowIfNotADate that throws an
exception in full codegen and deoptimizes in Crankshaft, which means the
code for the current use cases is roughly the same (modulo some register
renamings/gap moves).

R=bmeurer@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/92d5c48f743f370c9437008e05b0cb7c75857176
Cr-Commit-Position: refs/heads/master@{#28794}

[dstence, 2015-06-03 16:57:16]

lgtm

[MTBrandyberry, 2015-06-03 16:58:32]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-06-03 16:58:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1170463002/1

[commit-bot: I haz the power, 2015-06-03 17:22:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-03 17:22:16]

Patchset 1 (id:??) landed as
https://crrev.com/92d5c48f743f370c9437008e05b0cb7c75857176
Cr-Commit-Position: refs/heads/master@{#28794}