Merging r229911 by d0k:

MC: Allow multiple comma-separated expressions on the .uleb128
directive.

For compatiblity with GNU as. Binutils documents this as
'.uleb128 expressions'. Subtle, isn't it?


git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@231675 91177308-0d34-0410-b5e6-96231b3b80d8