Fix interp: unknown type kind in markExternalValue when compiling libsecp256k1 wrappers

[hectorchu]

Hi,

The error is caused by markExternal not handling VectorTypes and MetadataTypes. Please add cases for them so that libsecp256k1 can compile successfully.

I suggest this diff, it seems to work:

diff --git a/interp/memory.go b/interp/memory.go
index 2812cd01..e5e6a801 100644
--- a/interp/memory.go
+++ b/interp/memory.go
@@ -223,6 +223,8 @@ func (mv *memoryView) markExternal(llvmValue llvm.Value, mark uint8) error {
                                }
                        }
                case llvm.ArrayTypeKind:
+                       fallthrough
+               case llvm.VectorTypeKind:
                        numElements := llvmType.ArrayLength()
                        for i := 0; i < numElements; i++ {
                                element := mv.r.builder.CreateExtractValue(llvmValue, i, "")
@@ -231,6 +233,7 @@ func (mv *memoryView) markExternal(llvmValue llvm.Value, mark uint8) error {
                                        return err
                                }
                        }
+               case llvm.MetadataTypeKind:
                default:
                        return errors.New("interp: unknown type kind in markExternalValue")
                }

[deadprogram]

Hello @hectorchu do feel free to submit a PR with your desired changes. See https://tinygo.org/docs/guides/contributing/ for more info. Thanks!