Remove buggy 'addAttributes(unsigned, AttrBuilder)' overload

The 'addAttributes(unsigned, AttrBuilder)' overload delegated to 'get'
instead of 'addAttributes'.

Since we can implicitly construct an AttrBuilder from an AttributeSet,
just standardize on AttrBuilder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300651 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed