[optimizing compiler] Support x86 hard float ABI

Add support for the new ABI passing FP parameters in XMM0-XMM3.  This
allows us to optimize for x86 methods that don't use 'long'.

Change-Id: Ic79a24767173451e7d7095ccc2a00b307593a868
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>
3 files changed