AMDGPU: Improve note directive verification in assembler

  - Do not allow amd_amdgpu_isa directives on non-amdgcn architectures
  - Do not allow amd_amdgpu_hsa_metadata on non-amdhsa OSes
  - Do not allow amd_amdgpu_pal_metadata on non-amdpal OSes

Differential Revision: https://reviews.llvm.org/D38750


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315812 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed