[lld] r182033 - [lld] Do not create a temporary pair.

[Rui Ueyama]

I thought that the new code a bit cleaner because the repeated "->first"
were removed and the type become obvious, but I'm open to changing it.

llvm::tie wouldn't work because allocatedNew should change from false to
true only. Once it becomes true it shouldn't become false again.
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