GPU Calc: unit test cases for BETAINV

Turn  NO_FALLBACK_TO_SWINTERP on in  formulagroupcl.cxx for test

resolve compile warning in opbase.cxx

AMLOEXT-201 BUG

Change-Id: I82917b13c43c1bcaa01928b89210c8eb7495a167
Signed-off-by: haochen <haochen@multicorewareinc.com>
Signed-off-by: I-Jui (Ray) Sung <ray@multicorewareinc.com>
GPU Calc: implemented BETAINV

AMLOEXT-201 FIX

Change-Id: I68a7277b7353ed5a6f4d2ea8d1a4f7fb894bf487
Signed-off-by: haochen <haochen@multicorewareinc.com>