Fix crash bug when deoptimizing from an optimized sqrt operation.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 17050)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -2172,6 +2172,13 @@
 
 void StaticCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label skip_call;
+  if (!compiler->is_optimizing()) {
+    // Some static calls can be optimized by the optimizing compiler (e.g. sqrt)
+    // and therefore need a deoptimization descriptor.
+    compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
+                                   deopt_id(),
+                                   token_pos());
+  }
   if (function().name() == Symbols::EqualOperator().raw()) {
     compiler->EmitSuperEqualityCallPrologue(locs()->out().reg(), &skip_call);
   }