[X86][SSE] Dropped old INSERT_VECTOR_ELT lowering TODO

Target shuffle combining now supports the matching of INSERT_VECTOR_ELT/PINSRW/PINSRB for merging multiple insertions into shuffles/bitmasks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305788 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed