[interpreter] Add support for scalable operands.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index a2fd860bbc1dfe78f6b5619bfa1a5f8ea76dd628..9f1cce27634c31583b4cdb30f6686ca6ace28808 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -113,6 +113,7 @@ const int kMaxUInt16 = (1 << 16) - 1;
 const int kMinUInt16 = 0;
 
 const uint32_t kMaxUInt32 = 0xFFFFFFFFu;
+const int kMinUInt32 = 0;
 
 const int kCharSize      = sizeof(char);      // NOLINT
 const int kShortSize     = sizeof(short);     // NOLINT