[AVX512] Pull pattern for subvector insert into the instruction definition

No functional change intended.

Very similar to the change I made for subvector extract in r218480.

test/CodeGen/X86/avx512-insert-extract.ll covers this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218928 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed