Duncan P. N. Exon Smith 1d1c287c07 IR: Drop metadata references more aggressively during teardown ... Sometimes teardown happens before the debug info graph is complete (e.g., when clang throws an error). In that case, `MDNode`s will still have RAUW, so deleting constants that the `MDNode`s point at will be relatively expensive -- it'll cause re-uniquing all up the chain (what I've been referring to as "teardown madness"). So, drop references *before* deleting constants. We need to drop a few more references now: the metadata side of the metadata/value bridges needs to be dropped off the cliff along with the rest of it (previously, the bridges were cleaned before we did anything with the `MDNode`s). There's no real functionality change here -- state before and after `LLVMContextImpl::~LLVMContextImpl()` is unchanged -- so no testcase. llvm-svn: 226044		2015-01-14 21:58:17 +00:00
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llvm	IR: Drop metadata references more aggressively during teardown	2015-01-14 21:58:17 +00:00
llvm-c	Finish removing DestroySource.	2014-12-23 19:16:45 +00:00