Use a different map to distinguish eval contexts

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 0720c3d083543b0dfa83930f8a0981a567546156..f6d5d9e88d6c76cd28d61f95a02cb9de4f96e527 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -190,14 +190,22 @@ void FullCodeGenerator::Generate() {
         __ Push(rdx);  // Preserve new target.
       }
       if (slots <= FastNewFunctionContextStub::kMaximumSlots) {
-        FastNewFunctionContextStub stub(isolate());
-        __ Set(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
-        __ CallStub(&stub);
+        if (info->scope()->is_eval_scope()) {
+          FastNewEvalContextStub stub(isolate());
+          __ Set(FastNewEvalContextDescriptor::SlotsRegister(), slots);
+          __ CallStub(&stub);
+        } else {
+          FastNewFunctionContextStub stub(isolate());
+          __ Set(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
+          __ CallStub(&stub);
+        }
         // Result of FastNewFunctionContextStub is always in new space.
         need_write_barrier = false;
       } else {
         __ Push(rdi);
-        __ CallRuntime(Runtime::kNewFunctionContext);
+        __ CallRuntime(info->scope()->is_eval_scope()
+                           ? Runtime::kNewEvalContext
+                           : Runtime::kNewFunctionContext);
       }
       if (info->scope()->new_target_var() != nullptr) {
         __ Pop(rdx);  // Restore new target.