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This pass converts LLVM's special symbols llvm.global_ctors and
llvm.global_dtors to concrete arrays, __init_array_start/end and
__fini_array_start/end, that are usable by a C library.
The pass sorts the contents of global_ctors/dtors according to the
priority values they contain and removes the priority values.
This pass will allow us to simplify the PNaCl ABI so that less is done
at translation time.
BUG= http://code.google.com/p/nativeclient/issues/detail?id=3018
TEST=test/Transforms/NaCl/expand-ctors*.ll
Review URL: https://codereview.chromium.org/10977030
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