AMDHSA: Put old assembler docs back

Until we switch to code object v3 by default.
Follow up for https://reviews.llvm.org/D47736.

Differential Revision: https://reviews.llvm.org/D48497


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335378 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed