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An MDNode has a list of MDNodeOperands allocated directly after it as part of its allocation. Therefore, the Parent of the MDNodeOperands can be found by walking back through the operands to the beginning of that list. Mark the first operand's value pointer as being the 'first' operand so that we know where the beginning of said list is. This saves a *lot* of space during LTO with -O0 -g flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154280 91177308-0d34-0410-b5e6-96231b3b80d8
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