Port flow_graph*, disassembler to ISL_Print

runtime/vm/disassembler.h

Index: runtime/vm/disassembler.h
diff --git a/runtime/vm/disassembler.h b/runtime/vm/disassembler.h
index 001649e1937b83b90d6cf4ff31cf2e27b6da6dcf..86413f868c90aee90b98d56743a8bc52647c0677 100644
--- a/runtime/vm/disassembler.h
+++ b/runtime/vm/disassembler.h
@@ -8,6 +8,7 @@
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/globals.h"
+#include "vm/log.h"
 
 namespace dart {
 
@@ -98,11 +99,13 @@ class Disassembler : public AllStatic {
                           uword end,
                           const Code& code) {
     DisassembleToStdout stdout_formatter;
+    LogBlock lb(Isolate::Current());
     Disassemble(start, end, &stdout_formatter, code);
   }
 
   static void Disassemble(uword start, uword end) {
     DisassembleToStdout stdout_formatter;
+    LogBlock lb(Isolate::Current());
     Disassemble(start, end, &stdout_formatter);
   }