Revert of [turbofan] Various fixes to allow unboxed doubles as arguments in registers...

Revert of [turbofan] Various fixes to allow unboxed doubles as arguments in registers and on the stack. (patchset #7 id:120001 of https://codereview.chromium.org/1263033004/ )

Reason for revert:
This CL breaks MIPS (roll blocker).

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20mipsel%20-%20sim/builds/2061/steps/Check/logs/Run_Int32_Select_1

Original issue's description:
> [turbofan] Various fixes to allow unboxed doubles as arguments in registers and on the stack.
>
> R=jarin@chromium.org
> BUG=
>
> Committed: https://crrev.com/71409be5395f867bbca0f6998bf6caa175cd8192
> Cr-Commit-Position: refs/heads/master@{#30091}

TBR=jarin@chromium.org,titzer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/31a3f68da91084008a845bd6f7692dae3a0ec400
Cr-Commit-Position: refs/heads/master@{#30101}

[Yang, 2015-08-11 06:48:05]

Created Revert of [turbofan] Various fixes to allow unboxed doubles as arguments
in registers and on the stack.

[Jarin, 2015-08-11 06:53:47]

lgtm