[region-isolation] Return the old way of printing ActorIsolation for use when printing SIL instructions.

Author: gottesmm

include/swift/AST/ActorIsolation.h

@@ -266,6 +266,8 @@ class ActorIsolation {
 
   void print(llvm::raw_ostream &os) const;
 
+  void printForSIL(llvm::raw_ostream &os) const;
+
   void printForDiagnostics(llvm::raw_ostream &os,
                            StringRef openingQuotationMark = "'") const;
 

lib/AST/TypeCheckRequests.cpp

@@ -1760,6 +1760,30 @@ void ActorIsolation::print(llvm::raw_ostream &os) const {
   llvm_unreachable("Covered switch isn't covered?!");
 }
 
+void ActorIsolation::printForSIL(llvm::raw_ostream &os) const {
+  switch (getKind()) {
+  case Unspecified:
+    os << "unspecified";
+    return;
+  case ActorInstance:
+    os << "actor_instance";
+    return;
+  case Nonisolated:
+    os << "nonisolated";
+    return;
+  case NonisolatedUnsafe:
+    os << "nonisolated_unsafe";
+    return;
+  case GlobalActor:
+    os << "global_actor";
+    return;
+  case Erased:
+    os << "erased";
+    return;
+  }
+  llvm_unreachable("Covered switch isn't covered?!");
+}
+
 void ActorIsolation::dumpForDiagnostics() const {
   printForDiagnostics(llvm::dbgs());
   llvm::dbgs() << '\n';

lib/SIL/IR/SILPrinter.cpp

@@ -1550,11 +1550,17 @@ class SILPrinter : public SILInstructionVisitor<SILPrinter> {
       *this << "[noasync] ";
     if (auto isolationCrossing = AI->getIsolationCrossing()) {
       auto callerIsolation = isolationCrossing->getCallerIsolation();
-      if (callerIsolation != ActorIsolation::Unspecified)
-        *this << "[callee_isolation=" << callerIsolation << "] ";
+      if (callerIsolation != ActorIsolation::Unspecified) {
+        *this << "[callee_isolation=";
+        callerIsolation.printForSIL(PrintState.OS);
+        *this << "] ";
+      }
       auto calleeIsolation = isolationCrossing->getCalleeIsolation();
-      if (calleeIsolation != ActorIsolation::Unspecified)
-        *this << "[caller_isolation=" << calleeIsolation << "] ";
+      if (calleeIsolation != ActorIsolation::Unspecified) {
+        *this << "[caller_isolation=";
+        calleeIsolation.printForSIL(PrintState.OS);
+        *this << "] ";
+      }
     }
     visitApplyInstBase(AI);
   }