[nfc]Fix test gold/x86/thinlto.ll with GV Summary change (#88429)

This gold thinlto test should have been updated in commit dda73336
(https://github.com/llvm/llvm-project/commit/dda73336ad22bd0b5ecda17040c50fb10fcbe5fb).

It's ok to keep {Inputs/emit-llvm.foo.ll, Inputs/emit-llvm.bar.ll} the
current way for `llvm-as` since the field is optional (see example in
https://github.com/llvm/llvm-project/blob/5d6d8dcd292e0a107b11d378932eee9c2f9ccfc7/llvm/test/Assembler/thinlto-summary.ll#L12-L16)