[X86] Add comment string for broadcast loads from the constant pool.

[X86] Add comment string for broadcast loads from the constant pool.

Summary:
When broadcasting from the constant pool its useful to print out the final vector similar to what we do for normal moves from the constant pool.

I changed only a couple tests that were broadcast focused. One of them had been previously hand tweaked after running the script so that it could check the constant pool declaration. But I think this patch makes that unnecessary now since we can check the comment instead.

Reviewers: spatel, RKSimon, zvi

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34923

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307062 91177308-0d34-0410-b5e6-96231b3b80d8