[Hexagon] Deleting a lot of old variants of intrinsics and updating references.

llvm-svn: 227338
diff --git a/llvm/lib/Target/Hexagon/HexagonIntrinsicsDerived.td b/llvm/lib/Target/Hexagon/HexagonIntrinsicsDerived.td
index df89378..4c28b28 100644
--- a/llvm/lib/Target/Hexagon/HexagonIntrinsicsDerived.td
+++ b/llvm/lib/Target/Hexagon/HexagonIntrinsicsDerived.td
@@ -14,8 +14,8 @@
 def : Pat <(mul DoubleRegs:$src1, DoubleRegs:$src2),
       (i64
        (A2_combinew
-        (HEXAGON_M2_maci
-         (HEXAGON_M2_maci
+        (M2_maci
+         (M2_maci
           (i32
            (EXTRACT_SUBREG
             (i64