SWDEV-1 - OpenCL binary substituion feature based on source program text hash matching.

This patch allows to substitute binary for the opencl program. It supposed to be used as:

1. Run the opencl program with -save-temps.

2. Open the cl temp and find the following text in the program header:
    Hash to override:
	Source: 0xd66bcfa20e69e605
	Source + clang options: 0x656a9dd8aedcbfb6

3. Create config file (ascii text) with a pair(s):

    <hash> <path_to_binary_to_substitute>

    where hash is the hex value from step 2 (without leading 0x), you can use either hash
    depending on what you're going to match:
	only the source text of the program or along with it's clang options.

4. Set the env variable AMD_OCL_SUBST_OBJFILE to the path of your config file.

5. Rerun the opencl program.

Change-Id: I977c80fe529ea14458194918c6ddfbe2de6a8857

rocclr/device/devprogram.hpp

@@ -457,6 +457,10 @@ class Program : public amd::HeapObject {
   bool createKernelMetadataMap();
 #endif
 
+  bool trySubstObjFile(const char *SubstCfgFile,
+                       const std::string& sourceCode,
+                       const amd::option::Options* options);
+
   //! Disable default copy constructor
   Program(const Program&);