[ORC] Clear SymbolToDefinitionMap when materializing a MaterializationUnit.
The map is inaccessible at this point, so we may as well reclaim the memory
early.
llvm-svn: 343395
diff --git a/llvm/lib/ExecutionEngine/Orc/Layer.cpp b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
index 38afead..f74f1c8 100644
--- a/llvm/lib/ExecutionEngine/Orc/Layer.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
@@ -76,6 +76,11 @@
void BasicIRLayerMaterializationUnit::materialize(
MaterializationResponsibility R) {
+ // Throw away the SymbolToDefinition map: it's not usable after we hand
+ // off the module.
+ SymbolToDefinition.clear();
+
+ // If cloneToNewContextOnEmit is set, clone the module now.
if (L.getCloneToNewContextOnEmit())
TSM = cloneToNewContext(TSM);