[generators] Create the fixed array holding the registers only once.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index cd939cb33d1ef94b98621396bfde85b210556947..d9b41e96a5344581a9687fdaa53abc2e32ac2056 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -609,7 +609,7 @@ void Oddball::OddballVerify() {
     CHECK(number->IsSmi());
     int value = Smi::cast(number)->value();
     // Hidden oddballs have negative smis.
-    const int kLeastHiddenOddballNumber = -6;
+    const int kLeastHiddenOddballNumber = -7;
     CHECK_LE(value, 1);
     CHECK(value >= kLeastHiddenOddballNumber);
   }
@@ -634,6 +634,8 @@ void Oddball::OddballVerify() {
     CHECK(this == heap->exception());
   } else if (map() == heap->optimized_out_map()) {
     CHECK(this == heap->optimized_out());
+  } else if (map() == heap->stale_register_map()) {
+    CHECK(this == heap->stale_register());
   } else {
     UNREACHABLE();
   }