apply patches from Spack to various ROCm components

[BenWibking]

There are several patches applied by Spack when installing various ROCm components in order to work around bugs.

Patches for llvm-amdgpu (https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/llvm-amdgpu):

• https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/llvm-amdgpu/001-Add-i1-mul-patterns.patch
• https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/llvm-amdgpu/adjust-openmp-bitcode-directory-for-llvm-link.patch
• https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/llvm-amdgpu/patch-llvm-5.5.0.patch

It would be useful to have these patches included. This might also enable newer ROCm modules to be built with these scripts.