A64: Implement SHA1H

This is a fairly trivial instruction it's essentially:

result = ROL(data, 30);

src/frontend/A64/translate/impl/simd_sha.cpp

@@ -0,0 +1,21 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic::A64 {
+
+bool TranslatorVisitor::SHA1H(Vec Vn, Vec Vd) {
+    const IR::U128 data = ir.GetS(Vn);
+
+    const IR::U128 result = ir.VectorOr(ir.VectorLogicalShiftLeft(32, data, 30),
+                                        ir.VectorLogicalShiftRight(32, data, 2));
+
+    ir.SetS(Vd, result);
+    return true;
+}
+
+} // namespace Dynarmic::A64