Increase BlockCapacity from 8 to 16 for intrusive BasicBlockSet.

InstructionRange uses 3 sets. Some algorithms need two active ranges at the top-level. Additionally, utilities often have few levels of nesting that each require a block set.

Author: atrick

include/swift/SILOptimizer/PassManager/PassManager.h

@@ -73,7 +73,7 @@ class SwiftPassInvocation {
 
   SILSSAUpdater *ssaUpdater = nullptr;
 
-  static constexpr int BlockSetCapacity = 8;
+  static constexpr int BlockSetCapacity = 16;
   char blockSetStorage[sizeof(BasicBlockSet) * BlockSetCapacity];
   bool aliveBlockSets[BlockSetCapacity];
   int numBlockSetsAllocated = 0;