Increase strictness of asm type conversions.

src/type-cache.h

Index: src/type-cache.h
diff --git a/src/type-cache.h b/src/type-cache.h
index 0f70528776f4eac865f71f456d3702d3b037d44f..497ff619a4acedd577e763a90084005db326807b 100644
--- a/src/type-cache.h
+++ b/src/type-cache.h
@@ -47,6 +47,8 @@ class TypeCache final {
   Type* const kInteger = CreateRange(-V8_INFINITY, V8_INFINITY);
   Type* const kWeakint = Type::Union(kInteger, Type::MinusZeroOrNaN(), zone());
 
+  Type* const kIntegral32 = Type::Union(kInt32, kUint32, zone());
+
   // The FixedArray::length property always containts a smi in the range
   // [0, FixedArray::kMaxLength].
   Type* const kFixedArrayLengthType = CreateNative(