Add mradds to the powerpc intrinsics

Author: lu-zero

src/etc/platform-intrinsics/powerpc.json

@@ -16,6 +16,13 @@
             "llvm": "vperm",
             "ret": "s32",
             "args": ["0", "0", "s8"]
+        },
+        {
+            "intrinsic": "mradds",
+            "width": [128],
+            "llvm": "vmhraddshs",
+            "ret": "s16",
+            "args": ["0", "0", "0"]
         }
     ]
 }

src/librustc_platform_intrinsics/powerpc.rs

@@ -27,6 +27,11 @@ pub fn find(name: &str) -> Option<Intrinsic> {
             output: &::I32x4,
             definition: Named("llvm.ppc.altivec.vperm")
         },
+        "_vec_mradds" => Intrinsic {
+            inputs: { static INPUTS: [&'static Type; 3] = [&::I16x8, &::I16x8, &::I16x8]; &INPUTS },
+            output: &::I16x8,
+            definition: Named("llvm.ppc.altivec.vmhraddshs")
+        },
         _ => return None,
     })
 }