Reduce register pressure on ARM, ARM64, and MIPS.

runtime/vm/simulator_arm64.cc

Index: runtime/vm/simulator_arm64.cc
===================================================================
--- runtime/vm/simulator_arm64.cc	(revision 36746)
+++ runtime/vm/simulator_arm64.cc	(working copy)
@@ -2142,6 +2142,14 @@
       result64 = rn_val64;
       result32 = rn_val32;
     }
+  } else if ((instr->Bits(29, 2) == 2) && (instr->Bits(10, 2) == 0)) {
+    // Format(instr, "csinv'sf'cond 'rd, 'rn, 'rm");
+    result64 = ~rm_val64;
+    result32 = ~rm_val32;
+    if (ConditionallyExecute(instr)) {
+      result64 = rn_val64;
+      result32 = rn_val32;
+    }
   } else {
     UnimplementedInstruction(instr);
     return;