[AMDGPU] Update relocation record description

Document which relocation records are static and dynamic.

Differential Revision: https://reviews.llvm.org/D45587


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329981 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed