P4 to Git Change 1202323 by xcui@merged_opencl_jxcwin on 2015/10/21 17:01:58

SWDEV-79347 - added a env variable to change the size of the minimum system memory requirement to avoid downgrade OCL support. The default is 2, which means 2GB

	code review:
	http://ocltc.amd.com/reviews/r/8754/

	precheckin:
	http://ocltc.amd.com:8111/viewModification.html?modId=60516&personal=true&buildTypeId=&tab=vcsModificationBuilds&show_all_builds=true

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/cpu/cpudevice.cpp#278 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpudevice.cpp#532 edit
... //depot/stg/opencl/drivers/opencl/runtime/utils/flags.hpp#243 edit

rocclr/runtime/device/gpu/gpudevice.cpp

@@ -763,7 +763,7 @@ Device::create(CALuint ordinal, CALuint numOfDevices)
     appProfile_.init();
 
     bool smallMemSystem = false;
-    if (amd::Os::hostTotalPhysicalMemory() < 2 * Gi) {
+    if (amd::Os::hostTotalPhysicalMemory() < OCL_SYSMEM_REQUIREMENT * Gi) {
         smallMemSystem = true;
     }