ARM: Tweak ECMAToInt32VFP to address regression on Nexus 4
After r13912, we saw a small regression in Kraken crypto-aes and
crypto-ccm on Nexus 4. This patch, proposed by Rodolph Perfetta,
addresses that without regressing other platforms.
Instead of looking at the exponent of double_input and trying to figure
out if the conversion will overflow, eagerly do the VCVT and return
early unless it saturated.
BUG=none
Review URL: https://chromiumcodereview.appspot.com/
12544025
Patch from Hans Wennborg <hans@chromium.org>.
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13948
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