Add support for vector types and vector constants.

src/IceTypes.h

Index: src/IceTypes.h
diff --git a/src/IceTypes.h b/src/IceTypes.h
index a919465026d77a8fdb4af2ee3ad0cc671ee17cea..6bc2ded5ec63f8d9d388eef2cd14426a7a6b8928 100644
--- a/src/IceTypes.h
+++ b/src/IceTypes.h
@@ -21,7 +21,7 @@
 namespace Ice {
 
 enum Type {
-#define X(tag, size, align, str) tag,
+#define X(tag, size, align, elts, elty, str) tag,
   ICETYPE_TABLE
 #undef X
       IceType_NUM
@@ -43,6 +43,10 @@ enum OptLevel {
 
 size_t typeWidthInBytes(Type Ty);
 size_t typeAlignInBytes(Type Ty);
+size_t typeNumElements(Type Ty);
+Type typeElementType(Type Ty);
+
+inline bool isVectorType(Type Ty) { return typeNumElements(Ty) > 1; }
 
 template <> Ostream &operator<<(class Ostream &Str, const Type &Ty);