Move all register allocator environment initialization into class Environment.

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 cc0c7dfe49b706488dc29d0c9ade189d312eb7eb..699cd19c06cc94cd7d56734d9984e6369bc72e78 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -6,6 +6,7 @@
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
+#include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/locations.h"
@@ -1359,6 +1360,38 @@ void PushArgumentInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+void Environment::InitializeLocations(FlowGraphAllocator* allocator,
+                                      intptr_t block_start_pos,
+                                      intptr_t environment_pos) {
+  // Any value mentioned in the deoptimization environment should survive
+  // until the end of instruction but it does not need to be in the register.
+  // Expected shape of live range:
+  //
+  //                 i  i'
+  //      value    -----*
+  //
+  ASSERT(locations_ == NULL);
+  location_count_ = values_.length();
+  if (location_count_ > 0) {
+    locations_ =
+        Isolate::Current()->current_zone()->Alloc<Location>(location_count_);
+    for (intptr_t i = 0; i < location_count_; ++i) {
+      Value* value = values_[i];
+      if (value->IsUse()) {
+        locations_[i] = Location::Any();
+        const intptr_t vreg = value->AsUse()->definition()->ssa_temp_index();
+        LiveRange* range = allocator->GetLiveRange(vreg);
+        range->AddUseInterval(block_start_pos, environment_pos);
+        range->AddUse(environment_pos, &locations_[i]);
+      } else {
+        ASSERT(value->IsConstant());
+        locations_[i] = Location::NoLocation();
+      }
+    }
+  }
+}
+
+
 #undef __
 
 }  // namespace dart