8224671: AArch64: mauve System.arraycopy test failure

Reviewed-by: adinn

src/hotspot/cpu/aarch64/assembler_aarch64.hpp

@@ -1491,6 +1491,25 @@ public:
   INSN(eorw, 0, 0b10, 0);
   INSN(andsw, 0, 0b11, 0);
 
+#undef INSN
+
+#define INSN(NAME, size, op, N)                                         \
+  void NAME(Register Rd, Register Rn, Register Rm,                      \
+            enum shift_kind kind = LSL, unsigned shift = 0) {           \
+    starti;                                                             \
+    f(N, 21);                                                           \
+    zrf(Rm, 16), zrf(Rn, 5), zrf(Rd, 0);                                \
+    op_shifted_reg(0b01010, kind, shift, size, op);                     \
+  }                                                                     \
+                                                                        \
+  /* These instructions have no immediate form. Provide an overload so  \
+     that if anyone does try to use an immediate operand -- this has    \
+     happened! -- we'll get a compile-time error. */                    \
+  void NAME(Register Rd, Register Rn, unsigned imm,                     \
+            enum shift_kind kind = LSL, unsigned shift = 0) {           \
+    assert(false, " can't be used with immediate operand");             \
+  }
+
   INSN(bic, 1, 0b00, 1);
   INSN(orn, 1, 0b01, 1);
   INSN(eon, 1, 0b10, 1);

src/hotspot/cpu/aarch64/c1_LIRAssembler_aarch64.cpp

@@ -2268,7 +2268,7 @@ void LIR_Assembler::emit_arraycopy(LIR_OpArrayCopy* op) {
     __ ldr(src,              Address(sp, 4*BytesPerWord));
 
     // r0 is -1^K where K == partial copied count
-    __ eonw(rscratch1, r0, 0);
+    __ eonw(rscratch1, r0, zr);
     // adjust length down and src/end pos up by partial copied count
     __ subw(length, length, rscratch1);
     __ addw(src_pos, src_pos, rscratch1);