Fix disassembly comments

runtime/vm/disassembler.cc

Index: runtime/vm/disassembler.cc
diff --git a/runtime/vm/disassembler.cc b/runtime/vm/disassembler.cc
index 859d9d077258c5a3299c5ce7c6523c375dfe6cf4..b4ba2a08266e91a14a452d79e687071a83415562 100644
--- a/runtime/vm/disassembler.cc
+++ b/runtime/vm/disassembler.cc
@@ -33,9 +33,18 @@ void DisassembleToStdout::ConsumeInstruction(char* hex_buffer,
 
 void DisassembleToStdout::Print(const char* format, ...) {
   va_list args;
+
+  va_start(args, format);
+  intptr_t len = OS::VSNPrint(NULL, 0, format, args);
+  va_end(args);
+
+  char* p = reinterpret_cast<char*>(malloc(len+1));
   va_start(args, format);
-  OS::VFPrint(stdout, format, args);
+  OS::VSNPrint(p, len, format, args);
   va_end(args);
+
+  ISL_Print("%s", p);
+  free(p);
 }