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79e04c5844
Similarly to User which allocates a number of Use's prior to the this pointer, allocate space for the Name* for MCSymbol only when we need a name. Given that an MCSymbol is 48-bytes on 64-bit systems, this saves a decent % of space. Given the verify_uselistorder test case with debug info and llc, 50k symbols have names out of 700k so this optimises for the common case of temporary unnamed symbols. Reviewed by David Blaikie. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239423 91177308-0d34-0410-b5e6-96231b3b80d8
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