Axle: Implement Matrix<T, N> and Matrix<T, N, M> syntactic sugar.

This completes the majority of <rdar://problem/15100137>.


Swift SVN r9098

lib/Serialization/ModuleFormat.h

@@ -308,6 +308,7 @@ namespace decls_block {
     OPTIONAL_TYPE,
     SIL_FUNCTION_TYPE,
     VEC_TYPE,
+    MATRIX_TYPE,
 
     TYPE_ALIAS_DECL = 100,
     GENERIC_TYPE_PARAM_DECL,
@@ -516,6 +517,14 @@ namespace decls_block {
     BCVBR<6>     // length
   >;
 
+  using MatrixTypeLayout = BCRecordLayout<
+    MATRIX_TYPE,
+    TypeIDField,  // element type
+    BCVBR<6>,     // rows
+    BCVBR<6>,     // columns
+    BCFixed<1>    // columns specified
+  >;
+
   using ArrayTypeLayout = BCRecordLayout<
     ARRAY_TYPE,
     TypeIDField, // element type