Make ICData changes thread safe (first compute array, then set it). Install code in the main thread…

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index 2389dfc082d2cabb3860847df5470fe85dddf671..f063e7dae66ddea337a74b2470f6eab49cd5630f 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -5,6 +5,7 @@
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
+#include "vm/compiler.h"
 #include "vm/constant_propagator.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ -537,6 +538,11 @@ CatchBlockEntryInstr* GraphEntryInstr::GetCatchEntry(intptr_t index) {
 }
 
 
+bool GraphEntryInstr::IsCompiledForOsr() const {
+  return osr_id_ != Compiler::kNoOSRDeoptId;
+}
+
+
 // ==== Support for visiting flow graphs.
 
 #define DEFINE_ACCEPT(ShortName)                                               \