Add "sc.opencl" logging area

Change-Id: Icd851c17bab1f55cd16d5a48cc71ff2ac91daa2c

sc/source/core/data/formulacell.cxx

@@ -436,6 +436,7 @@ ScFormulaCellGroup::~ScFormulaCellGroup()
                 assert(mxCLKernelThread.is());
                 mxCLKernelThread->finish();
                 mxCLKernelThread->join();
+                SAL_INFO("sc.opencl", "OpenCL kernel compilation thread has finished");
                 mxCLKernelThread.clear();
             }
     }

sc/source/core/tool/clkernelthread.cxx

@@ -26,9 +26,7 @@ CLBuildKernelThread::~CLBuildKernelThread()
 
 void CLBuildKernelThread::execute()
 {
-    SAL_INFO("sc", "opencl-buildkernel-thread running");
-
-    SAL_INFO("sc", "opencl-buildkernel-thread finishing");
+    SAL_INFO("sc.opencl", "opencl-buildkernel-thread running");
 }
 
 void CLBuildKernelThread::produce()
@@ -41,7 +39,7 @@ void CLBuildKernelThread::consume()
 
 void CLBuildKernelThread::finish()
 {
-    SAL_INFO("sc", "opencl-buildkernel-thread request to finish");
+    SAL_INFO("sc.opencl", "opencl-buildkernel-thread request to finish");
 }
 
 }