[3.9.1] Merging r282613 - [X86][AVX] Add test showing that VBROADCAST loads...

[3.9.1] Merging r282613 - [X86][AVX] Add test showing that VBROADCAST loads don't correctly respect dependencies

As discussed in PR30596, this is a preliminary test update before we can merge r283070

Note: This required the test to be regenerated after the merge as 3.9.1 doesn't have trunk's latest lea -> mov simplifications
llvm-svn: 286248