Prepare offline compiler to add -gen_file option

Add dummy option to ocloc cmd. This is a preparation to add
a new option that will control dumping gen file.

Signed-off-by: Mateusz Borzyszkowski <mateusz.borzyszkowski@intel.com>

shared/offline_compiler/source/offline_compiler.cpp

@@ -666,6 +666,8 @@ int OfflineCompiler::parseCommandLine(size_t numArgs, const std::vector<std::str
             inputFileSpirV = true;
         } else if ("-cpp_file" == currArg) {
             useCppFile = true;
+        } else if ("-gen_file" == currArg) {
+            useGenFile = true;
         } else if (("-options" == currArg) && hasMoreArgs) {
             options = argv[argIndex + 1];
             argIndex++;
@@ -1021,6 +1023,8 @@ Usage: ocloc [compile] -file <filename> -device <device_type> [-output <filename
   -cpp_file                     Will generate c++ file with C-array
                                 containing Intel Compute device binary.
 
+  -gen_file                     Will generate gen file.
+
   -output_no_suffix             Prevents ocloc from adding family name suffix.
 
   --help                        Print this usage message.

shared/offline_compiler/source/offline_compiler.h

@@ -134,6 +134,7 @@ class OfflineCompiler {
     bool useLlvmText = false;
     bool useLlvmBc = false;
     bool useCppFile = false;
+    bool useGenFile = false;
     bool useOptionsSuffix = false;
     bool quiet = false;
     bool onlySpirV = false;