VM: Enable branch merging of isnan, isinf.

runtime/vm/simulator_dbc.cc

Index: runtime/vm/simulator_dbc.cc
diff --git a/runtime/vm/simulator_dbc.cc b/runtime/vm/simulator_dbc.cc
index c3998aff11a6ba832c47f211676d9cb4c8b44108..ddc01b9653be8cd345ba33f5cbb24ec2562e9cca 100644
--- a/runtime/vm/simulator_dbc.cc
+++ b/runtime/vm/simulator_dbc.cc
@@ -2229,16 +2229,16 @@ RawObject* Simulator::Call(const Code& code,
   }
 
   {
-    BYTECODE(DoubleIsNaN, A_D);
-    const double v = bit_cast<double, RawObject*>(FP[rD]);
-    FP[rA] = isnan(v) ? true_value : false_value;
+    BYTECODE(DoubleIsNaN, A);
+    const double v = bit_cast<double, RawObject*>(FP[rA]);
+    if (!isnan(v)) pc++;

[zra, 2016/10/31 17:28:15]

Please use {}

[Florian Schneider, 2016/10/31 18:48:17]

Done.

     DISPATCH();
   }
 
   {
-    BYTECODE(DoubleIsInfinite, A_D);
-    const double v = bit_cast<double, RawObject*>(FP[rD]);
-    FP[rA] = isinf(v) ? true_value : false_value;
+    BYTECODE(DoubleIsInfinite, A);
+    const double v = bit_cast<double, RawObject*>(FP[rA]);
+    if (!isinf(v)) pc++;

[zra, 2016/10/31 17:28:15]

ditto

[Florian Schneider, 2016/10/31 18:48:17]

Done.

     DISPATCH();
   }