Merge sin(a), cos(a) into one instruction. TODO: Implement for ARM and MIPS.

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
===================================================================
--- runtime/vm/flow_graph_type_propagator.cc	(revision 30802)
+++ runtime/vm/flow_graph_type_propagator.cc	(working copy)
@@ -1222,6 +1222,8 @@
 CompileType MergedMathInstr::ComputeType() const {
   if (kind() == MergedMathInstr::kTruncDivMod) {
     return CompileType::FromCid(kArrayCid);
+  } else if (kind() == MergedMathInstr::kSinCos) {
+    return CompileType::FromCid(kTypedDataFloat64ArrayCid);
   } else {
     UNIMPLEMENTED();
     return CompileType::Dynamic();