Implements int2fp, fp2int, and fp2fp conversions for ARM32.

64-bit ints (and vectors) are future work.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
R=kschimpf@google.com, stichnot@chromium.org

Review URL: https://codereview.chromium.org/1330933002 .
5 files changed