[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow, copying to a smaller ar…

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 1a3a007a8536c7b3188affcca5c6fb115c60998a..ad57af3954dd5b24d4d92f162fddaad84109f0e3 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1041,6 +1041,13 @@ Handle<FixedArray> Factory::CopyFixedArrayAndGrow(Handle<FixedArray> array,
                      FixedArray);
 }
 
+Handle<FixedArray> Factory::CopyFixedArrayUpTo(Handle<FixedArray> array,
+                                               int new_len,
+                                               PretenureFlag pretenure) {
+  CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->CopyFixedArrayUpTo(
+                                    *array, new_len, pretenure),
+                     FixedArray);
+}
 
 Handle<FixedArray> Factory::CopyFixedArray(Handle<FixedArray> array) {
   CALL_HEAP_FUNCTION(isolate(),