machinst x64: enable initial SIMD spec tests

build.rs

@@ -180,6 +180,10 @@ fn experimental_x64_should_panic(testsuite: &str, testname: &str, strategy: &str
     }
 
     match (testsuite, testname) {
+        ("simd", "simd_address") => return false,
+        ("simd", "simd_f32x4_arith") => return false,
+        ("simd", "simd_f64x2_arith") => return false,
+        ("simd", "simd_store") => return false,
         ("simd", _) => return true,
         _ => {}
     }