Reland HIP offload PGO compiler support and link the device-profile runtime (#201607) This mostly relands the compiler part of #177665 (approved and merged, then reverted in #201416). The first commit restores it as merged: the AMDGPU instrumentation in LLVM and the HIP codegen in Clang. #177665 was reverted because of a Windows CRT problem, fixed by splitting the ROCm runtime into a separate library clang_rt.profile_rocm (see the compiler-rt PR). The second commit links that library on the host for HIP device PGO, in addOffloadRTLibs for the Linux and MSVC toolchains, gated on HIP + profiling + the library being present. It is a superset of clang_rt.profile and is linked first, so the base library stays inert. Non-HIP links are unaffected. Depends on the compiler-rt PR that adds clang_rt.profile_rocm.
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