Fix inlining information:

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
diff --git a/runtime/vm/il_printer.cc b/runtime/vm/il_printer.cc
index 6a5ce9073112af1c3382df29d7b16352b888d2af..c6ff24941374ca86165251a94d9dc1310f9cd521 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -15,6 +15,8 @@ DEFINE_FLAG(bool, print_environments, false, "Print SSA environments.");
 DEFINE_FLAG(charp, print_flow_graph_filter, NULL,
     "Print only IR of functions with matching names");
 
+DECLARE_FLAG(bool, trace_inlining_intervals);
+
 void BufferFormatter::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
@@ -136,6 +138,9 @@ void FlowGraphPrinter::PrintOneInstruction(Instruction* instr,
   }
   if (!instr->IsBlockEntry()) ISL_Print("    ");
   ISL_Print("%s", str);
+  if (FLAG_trace_inlining_intervals) {
+    ISL_Print(" iid: %"Pd"", instr->inlining_id());
+  }
 }