X87: Disable test case for X87 because of double register number restriction.

X87: Disable test case for X87 because of double register number restriction.

These two test cases introduced by 8525136b require that the double register is >=2.
But currently on x87 turbofan implementation only 1 double register is supported.

BUG=

Committed: https://crrev.com/9726db81993d22eacfeaf52883e06a1a8c442c89
Cr-Commit-Position: refs/heads/master@{#30321}

[chunyang.dai, 2015-08-21 09:06:14]

chunyang.dai@intel.com changed reviewers:
+ titzer@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2015-08-21 09:06:15]

PTAL.

[titzer, 2015-08-21 10:29:00]

On 2015/08/21 09:06:15, chunyang.dai wrote:
> PTAL.

I think it would be better to edit the test so that it checks the number of
allocatable double registers. There are already a couple like that in the file.

[chunyang.dai, 2015-08-21 16:31:03]

Hi, Titzer.

thanks for your suggestion.

These two test cases already have the following check: 
  if (DoubleRegister::kMaxNumAllocatableRegisters < 2) return;

But for x87 platform, it's a special case that crankshaft support many double
registers
so Double::kMaxNumAllocatableRegisters is defined to 6 on X87 port.

When configuring the default register configuration for turbofan, we directly
use 1 in
the code according to your suggestion and we did not add one value to represent
the maximum
allocatable double register number for turbofan.
(https://codereview.chromium.org/1164813007/#msg8).

[chunyang.dai, 2015-08-24 04:52:26]

Hi, Titzer.

 I changed these two test cases to use
"RegisterConfiguration::ArchDefault()->num_double_registers()"
 to do the double register number restriction check. It will not use
"DoubleRegister::kMaxNumAllocatableRegisters"
 directly. 

 Please review it. 

 Thanks.

[titzer, 2015-08-24 07:15:26]

lgtm

[chunyang.dai, 2015-08-24 08:19:18]

The CQ bit was checked by chunyang.dai@intel.com

[commit-bot: I haz the power, 2015-08-24 08:19:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308763003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308763003/20001

[commit-bot: I haz the power, 2015-08-24 08:43:54]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-24 08:44:09]

Patchset 2 (id:??) landed as
https://crrev.com/9726db81993d22eacfeaf52883e06a1a8c442c89
Cr-Commit-Position: refs/heads/master@{#30321}