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This (partially) fixes a regression introduced by https://reviews.llvm.org/D43945 / r327399, which parallelized DwarfLinker. This patch avoids parsing and allocating the memory for all input DIEs up front and instead only allocates them in the concurrent loop in the AnalyzeLambda. At the end of the loop the memory from the LinkContext is cleared again. This reduces the peak memory needed to link the debug info of a non-modular build of the Swift compiler by >3GB. rdar://problem/43444464 Differential Revision: https://reviews.llvm.org/D51078 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340650 91177308-0d34-0410-b5e6-96231b3b80d8