JIT: Performance fix for const doubles

Some recent Arm processors take a performance hit when
creating a floating point double by loading it as a pair of singles.
Legacy code to support soft floating point doubles as a pair of core
registers loaded double immediates in this way.

With the CL, we handle double immediates as a single unit.

(cherry-pick of c8129911e598ad0ca8d7b31012444ab6ce8bce45.)

Change-Id: Ic1512e34bfd233a6f5ffd58ce843965adbbad875
remove duplicated call to dvmJitCalleeSave()

Change-Id: Ib7b5f637a22fd5ba60bdb45cd34ac8c1781c7bd3
Signed-off-by: Rocky Zhang <zhangyan.hit@gmail.com>