Free memory allocated in Swift from Swift, not C++

Author: DougGregor

include/swift/Bridging/ASTGen.h

@@ -155,6 +155,8 @@ intptr_t swift_ASTGen_configuredRegions(
     BridgedASTContext astContext,
     void *_Nonnull sourceFile,
     BridgedIfConfigClauseRangeInfo *_Nullable *_Nonnull);
+void swift_ASTGen_freeConfiguredRegions(
+    BridgedIfConfigClauseRangeInfo *_Nullable regions, intptr_t numRegions);
 
 #ifdef __cplusplus
 }

lib/ASTGen/Sources/ASTGen/CompilerBuildConfiguration.swift

@@ -275,3 +275,11 @@ extension SyntaxProtocol {
     return false
   }
 }
+
+@_cdecl("swift_ASTGen_freeConfiguredRegions")
+public func freeConfiguredRegions(
+  regions: UnsafeMutablePointer<BridgedIfConfigClauseRangeInfo>?,
+  numRegions: Int
+) {
+  UnsafeMutableBufferPointer(start: regions, count: numRegions).deallocate()
+}

lib/Sema/TypeCheckDecl.cpp

@@ -3134,7 +3134,7 @@ ArrayRef<IfConfigClauseRangeInfo> SourceFile::getIfConfigClauseRanges() const {
     IfConfigClauseRanges.Ranges.reserve(numRegions);
     for (intptr_t i = 0; i != numRegions; ++i)
       IfConfigClauseRanges.Ranges.push_back(regions[i].unbridged());
-    free(regions);
+    swift_ASTGen_freeConfiguredRegions(regions, numRegions);
 
     IfConfigClauseRanges.IsSorted = true;
   }