[region-isolation] Make sil-region-isolation-assert-on-unknown-pattern also work with TransferNonSendable versions of the error.

This asserts only option is an option to make it quicker/easier to triage
unknown pattern match errors by aborting when we emit it (allowing one to
immediately drop into the debugger at that point).

Previously, it only happened for errors in RegionAnalysis not in
TransferNonSendable itself.

include/swift/SILOptimizer/Analysis/RegionAnalysis.h

@@ -28,6 +28,12 @@ class RegionAnalysisValueMap;
 
 namespace regionanalysisimpl {
 
+#ifndef NDEBUG
+/// Global bool set only when asserts are enabled to ease debugging by causing
+/// unknown pattern errors to cause an assert so we drop into the debugger.
+extern bool AbortOnUnknownPatternMatchError;
+#endif
+
 using TransferringOperandSetFactory = Partition::TransferringOperandSetFactory;
 using Element = PartitionPrimitives::Element;
 using Region = PartitionPrimitives::Region;