Add the unconditional branch instruction, improve diagnostics for block
references.

PiperOrigin-RevId: 201872745
diff --git a/lib/IR/AsmPrinter.cpp b/lib/IR/AsmPrinter.cpp
index f857963..08fe838 100644
--- a/lib/IR/AsmPrinter.cpp
+++ b/lib/IR/AsmPrinter.cpp
@@ -120,6 +120,9 @@
 
 void CFGFunctionState::print(const TerminatorInst *inst) {
   switch (inst->getKind()) {
+  case TerminatorInst::Kind::Branch:
+    os << "  br bb" << getBBID(cast<BranchInst>(inst)->getDest()) << "\n";
+    break;
   case TerminatorInst::Kind::Return:
     os << "  return\n";
     break;