Introduce InvokeMathCFunction that can be used to directly invoke mathematical function provided by…

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 37566d94afb006a3446739fc2b3bcfc4ef445af6..bd501ace930f669541eab7a06e23cbe37f1f9559 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -556,6 +556,12 @@ void CheckClassInstr::PrintOperandsTo(BufferFormatter* f) const {
 }
 
 
+void InvokeMathCFunctionInstr::PrintOperandsTo(BufferFormatter* f) const {
+  f->Print("%s, ", MethodRecognizer::KindToCString(recognized_kind_));
+  Definition::PrintOperandsTo(f);
+}
+
+
 void GraphEntryInstr::PrintTo(BufferFormatter* f) const {
   const GrowableArray<Definition*>& defns = initial_definitions_;
   f->Print("B%"Pd"[graph]", block_id());