DynASM/ARM64: Fix ADRP encoding with absolute address.

(Switch to Mike Pall's version)

Author: dstogov

ext/opcache/jit/dynasm/dasm_arm64.h

@@ -482,11 +482,12 @@ int dasm_encode(Dst_DECL, void *buffer)
 	  }
 	  break;
 	case DASM_REL_A: {
-	  ptrdiff_t na;
+	  ptrdiff_t na = (((ptrdiff_t)(*b++) << 32) | (unsigned int)n);
 	  if ((ins & 0x3000) == 0x3000) {  /* ADRP */
-	    na = ((((ptrdiff_t)(*b++) << 32) | (unsigned int)n) & ~0xfff) - (((ptrdiff_t)cp - 4) & ~0xfff);;
+	    ins &= ~0x1000;
+	    na = (na >> 12) - (((ptrdiff_t)cp - 4) >> 12);
 	  } else {
-	    na = (((ptrdiff_t)(*b++) << 32) | (unsigned int)n) - (ptrdiff_t)cp + 4;
+	    na = na - (ptrdiff_t)cp + 4;
 	  }
 	  n = (int)na;
 	  CK_REL((ptrdiff_t)n == na, na);