Add missing "const" for kFastElementsKindSequence

Bug: chromium:747064
Change-Id: I1ae943785fc8048a0affd9eec9f0966056d43bee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1915660
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64955}

src/objects/elements-kind.cc

@@ -115,7 +115,7 @@ const char* ElementsKindToString(ElementsKind kind) {
   }
 }
 
-ElementsKind kFastElementsKindSequence[kFastElementsKindCount] = {
+const ElementsKind kFastElementsKindSequence[kFastElementsKindCount] = {
     PACKED_SMI_ELEMENTS,     // 0
     HOLEY_SMI_ELEMENTS,      // 1
     PACKED_DOUBLE_ELEMENTS,  // 2