test/codegen: fix PPC64 AddLargeConst test
Commit
061d77cb70 was published in parallel with another commit
36ecff0893 which changed how certain constants were generated.
Update the test to account for the changes.
Change-Id: I314b735a34857efa02392b7a0dd9fd634e4ee428
Reviewed-on: https://go-review.googlesource.com/c/go/+/536256
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