[builtins] Allow API callbacks to return BigInts

This fixes the debug code which checks that API callbacks
return only valid JS values: BigInt was missing from the list
of allowable types.

Bug: chromium:985115
Change-Id: I8b3db409bd99e9e9b936d520d0fdbe75654e7602
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1706623Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62812}

src/builtins/ia32/builtins-ia32.cc

@@ -3093,6 +3093,9 @@ void CallApiFunctionAndReturn(MacroAssembler* masm, Register function_address,
   __ CompareRoot(map, RootIndex::kHeapNumberMap);
   __ j(equal, &ok, Label::kNear);
 
+  __ CompareRoot(map, RootIndex::kBigIntMap);
+  __ j(equal, &ok, Label::kNear);
+
   __ CompareRoot(return_value, RootIndex::kUndefinedValue);
   __ j(equal, &ok, Label::kNear);
 

src/builtins/x64/builtins-x64.cc

@@ -3076,6 +3076,9 @@ void CallApiFunctionAndReturn(MacroAssembler* masm, Register function_address,
   __ CompareRoot(map, RootIndex::kHeapNumberMap);
   __ j(equal, &ok, Label::kNear);
 
+  __ CompareRoot(map, RootIndex::kBigIntMap);
+  __ j(equal, &ok, Label::kNear);
+
   __ CompareRoot(return_value, RootIndex::kUndefinedValue);
   __ j(equal, &ok, Label::kNear);