Added default module launch api functionality

1. As in hipModuleLaunchKernel(..., kernelParams, nullptr); works with this commit
    2. Added headers AMDGPUPTNote.h, AMDGPURuntimeMetadata.h to do code object meta data parsing
    3. Changed CMake to look at llvm link libraries
    4. HIP developer should set env variable LLVM_HOME to remove link errors
    5. HIP depends on installed LLVM (not source, not build)
    6. Added sample to test out the feature
    7. Right now HCC does not support embedding metadata in code object. Use clang opencl
    8. Changed HIPCC to read LLVM_HOME env var
    9. New argument to CMake should be given -DLLVM_HOME=<where llvm 5.0 is installed>

Change-Id: Iba38194aa872d97cc2c90a8e5ff746c48055c868


[ROCm/hip commit: 99432cc12c]

projects/hip/samples/0_Intro/module_api/runKernel.cpp

@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.
+Copyright (c) 2015-2017 Advanced Micro Devices, Inc. All rights reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -98,7 +98,7 @@ int main(){
       HIP_LAUNCH_PARAM_END
     };
 
-    hipModuleLaunchKernel(Function, 1, 1, 1, LEN, 1, 1, 0, 0, NULL, (void**)&config); 
+    hipModuleLaunchKernel(Function, 1, 1, 1, LEN, 1, 1, 0, 0, NULL, (void**)&config);
 
     hipMemcpyDtoH(B, Bd, SIZE);
     int mismatchCount = 0;