[ORC] Add CPU name and sub-target features to detectHost
[ORC] Add CPU name and sub-target features to detectHost

This commit adds host CPU name and sub-target features to the
`JITTargetMachineBuilder` created by `JITTargetMachineBuilder::detectHost()`.

Differential Revision: https://reviews.llvm.org/D65760



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@367944 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm