Let LLVM 5 add DW_OP_deref to indirect args itself

We needed to manually added the `DW_OP_deref` ourselves in earlier LLVM,
but starting with [D31439] in LLVM 5, it appears that LLVM will always
handle this itself.  When we were still adding this manually, the
resulting `.debug_loc` had too many derefs, and this failed test
`debuginfo/by-value-self-argument-in-trait-impl.rs`.

[D31439]: https://reviews.llvm.org/D31439

Fixes #47611.
cc @alexcrichton
r? @michaelwoerister

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