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Alexey Samsonov f021cb1cc1 [DWARF parser] Respect address ranges specified in compile unit DIE.
When address ranges for compile unit are specified in compile unit DIE
itself, there is no need to collect ranges from children subprogram DIEs.

This change speeds up llvm-symbolizer on Clang-produced binaries with
full debug info. For instance, symbolizing a first address in a 1Gb binary
is now 2x faster (1s vs. 2s).

llvm-svn: 206641
2014-04-18 20:30:27 +00:00
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