Fix -Wunused-private-field

Change-Id: Iedf121025a33bf08eed310e3d85302f8bf3ac7d9

rocclr/compiler/lib/utils/options.cpp

@@ -1345,7 +1345,6 @@ Options::Options() :
     kernelArgAlign(0),
     basename_max(0),
     OptionsLog(),
-    flagsSize (((OID_LAST + 31)/32) * 32),
     llvmargc(0),
     llvmargv(NULL),
     buildNo(0),

rocclr/compiler/lib/utils/options.hpp

@@ -309,7 +309,6 @@ private:
     std::string OptionsLog;
 
     // One bit for each flag.
-    const int flagsSize;
     uint32_t flags[(OID_LAST + 31)/32];
 
     int    llvmargc;