clang needs -mprofile-kernel switch for ppc64le

[sm00th]

During discussion in #1156 we found out that while it is possible to build a ppc64le kernel with clang, generated code is not kpatchable and clang needs an analog of gcc's -mprofile-kernel switch. @kamalesh-babulal is going to find out whether IBM's compiler team will be able to help us with that.

[jpoimboe]

I presume we would also need a clang plugin similar to our gcc plugin to insert nops after local calls.

[kamalesh-babulal]

I presume we would also need a clang plugin similar to our gcc plugin to insert nops after local calls.

I guess so, we might need a clang plugin variant too.

[kamalesh-babulal]

Quick update: I had checked with the compiler team on two questions.

1. If there is some alternative or undocumented switch in clang that's equal to that of gcc's -mprofile-kernel?
   clang lacks support for -mprofile-kernel equivalent.
2. Is this any work planned or in progress to have such switch?
   There are no plans to add it in the near future. I update the issue, if there is some news on it.

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