[test] Make absolute line numbers relative; NFC
[test] Make absolute line numbers relative; NFC

Done to remove noise from https://reviews.llvm.org/D32332 (and to make
this test more resilient to changes in general).


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@305947 91177308-0d34-0410-b5e6-96231b3b80d8

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