Use a different map to distinguish eval contexts

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f110f21f451638e6f11d08d1fb792eaea8f5a1ae..9590fbc489cd7989e01f84130e02a07cda54255a 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -113,6 +113,7 @@ class ObjectLiteral;
   V(FastCloneShallowObject)                   \
   V(FastNewClosure)                           \
   V(FastNewFunctionContext)                   \
+  V(FastNewEvalContext)                       \
   V(KeyedLoadSloppyArguments)                 \
   V(KeyedStoreSloppyArguments)                \
   V(LoadScriptContextField)                   \
@@ -865,6 +866,27 @@ class FastNewFunctionContextStub final : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(FastNewFunctionContext, TurboFanCodeStub);
 };
 
+class FastNewEvalContextStub final : public TurboFanCodeStub {
+ public:
+  static const int kMaximumSlots = 0x8000;
+
+  explicit FastNewEvalContextStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
+
+  static compiler::Node* Generate(CodeStubAssembler* assembler,
+                                  compiler::Node* function,
+                                  compiler::Node* slots,
+                                  compiler::Node* context);
+
+ private:
+  // FastNewEvalContextStub can only allocate closures which fit in the
+  // new space.
+  STATIC_ASSERT(((kMaximumSlots + Context::MIN_CONTEXT_SLOTS) * kPointerSize +
+                 FixedArray::kHeaderSize) < kMaxRegularHeapObjectSize);
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewEvalContext);
+  DEFINE_TURBOFAN_CODE_STUB(FastNewEvalContext, TurboFanCodeStub);
+};
 
 class FastNewObjectStub final : public PlatformCodeStub {
  public: