LLVM_IAS=1 x86_64 patches for 5.4 and 4.19

Dear Stable kernel maintainers, Please consider cherry picking

commit e81e07244325 ("objtool: Support Clang non-section symbols in ORC generation")

to linux-5.4.y and linux-4.19.y. This allows us to use LLVM_IAS=1 for x86_64 Android kernel builds without warning.

Its partner patch (8782e7cab51b6b) was already backported to linux-5.4.y as 8c627d4b15de9, and linux-4.19.y as 6e575122cd956.

https://github.com/ClangBuiltLinux/linux/issues/669 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...