MIPS compiler flags: use -mfp32 or -mfp64 only if -mhard-float is used.

MIPS compiler flags: use -mfp32, -mfp64, or -mfpxx only if -mhard-float
is used.

-mfp32, -mfp64, and -mfpxx only make sense if the FPU is used.

R=brettw@chromium.org,petarj@mips.com
BUG=446234
Committed: https://crrev.com/07fce68bd04aa5b28916f76173b0c6ead60eddde
Cr-Commit-Position: refs/heads/master@{#319227}

[wtc, 2015-03-03 23:21:41]

Please review. This implements Petar's suggestion in
https://codereview.chromium.org/883253003/#msg27. Thanks.

https://codereview.chromium.org/975183002/diff/1/build/common.gypi
File build/common.gypi (right):

https://codereview.chromium.org/975183002/diff/1/build/common.gypi#newcode2310
build/common.gypi:2310: 'mips_fpu_mode%': 'fp32',

I reordered these two build variables to suggest that mips_fpu_mode is
subordinate to mips_float_abi.

[brettw, 2015-03-04 00:04:34]

gm lgtm

[petarj, 2015-03-05 01:47:32]

lgtm

[petarj, 2015-03-05 01:51:58]

On 2015/03/05 01:47:32, petarj wrote:
> lgtm

Nit: This change is applicable for "fpxx" mode as well, which is not clear from
the commit message.

[wtc, 2015-03-05 01:56:59]

On 2015/03/05 01:51:58, petarj wrote:
> 
> Nit: This change is applicable for "fpxx" mode as well, which is not clear
from
> the commit message.

Done. I updated the CL's description. Thanks.

[wtc, 2015-03-05 04:26:14]

The CQ bit was checked by wtc@chromium.org

[commit-bot: I haz the power, 2015-03-05 04:26:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/975183002/1

[commit-bot: I haz the power, 2015-03-05 06:33:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-05 06:34:22]

Patchset 1 (id:??) landed as
https://crrev.com/07fce68bd04aa5b28916f76173b0c6ead60eddde
Cr-Commit-Position: refs/heads/master@{#319227}