Add operator<<(llvm::raw_ostream &os, SILIsolationInfo|SILDynamicMergedIsolationInfo.

Just slicing off a nice addition. These already had appropriate print methods so
this commit just exposes the print API in the raw_ostream format.

(cherry picked from commit 0b42f35)

Author: gottesmm

include/swift/SILOptimizer/Utils/SILIsolationInfo.h

@@ -493,4 +493,22 @@ class SILDynamicMergedIsolationInfo {
 
 } // namespace swift
 
+namespace llvm {
+
+inline llvm::raw_ostream &
+operator<<(llvm::raw_ostream &os,
+           const swift::SILIsolationInfo &isolationInfo) {
+  isolationInfo.printForOneLineLogging(os);
+  return os;
+}
+
+inline llvm::raw_ostream &
+operator<<(llvm::raw_ostream &os,
+           const swift::SILDynamicMergedIsolationInfo &isolationInfo) {
+  isolationInfo.printForOneLineLogging(os);
+  return os;
+}
+
+} // namespace llvm
+
 #endif