rx: Apply rx gdb patch to support rxv2 and rxv3

This update adds full support for the RXv2 and RXv3 architectures
across GDB, BFD, opcodes, and the RX simulator.
These changes align GDB and binutils with the new GCC RX backend and
enable debugging and simulation for RXv2 and RXv3 targets.
The changes are pick from https://llvm-gcc-renesas.com/rx/rx-latest-source-code/

Signed-off-by: Duy Nguyen <[email protected]>

Author: duynguyenxa

bfd/archures.c

@@ -454,6 +454,7 @@ DESCRIPTION
 .#define bfd_mach_rx		0x75
 .#define bfd_mach_rx_v2		0x76
 .#define bfd_mach_rx_v3		0x77
+.#define bfd_mach_rx_v3_dfpu  0x78
 .  bfd_arch_s390,      {* IBM s390.  *}
 .#define bfd_mach_s390_31	31
 .#define bfd_mach_s390_64	64
@@ -536,6 +537,10 @@ DESCRIPTION
 .#define bfd_mach_aarch64_8R	1
 .#define bfd_mach_aarch64_ilp32	32
 .#define bfd_mach_aarch64_llp64 64
+.  bfd_arch_nios2,     {* Nios II.  *}
+.#define bfd_mach_nios2		0
+.#define bfd_mach_nios2r1	1
+.#define bfd_mach_nios2r2	2
 .  bfd_arch_visium,    {* Visium.  *}
 .#define bfd_mach_visium	1
 .  bfd_arch_wasm32,    {* WebAssembly.  *}
@@ -677,6 +682,7 @@ extern const bfd_arch_info_type bfd_msp430_arch;
 extern const bfd_arch_info_type bfd_mt_arch;
 extern const bfd_arch_info_type bfd_nds32_arch;
 extern const bfd_arch_info_type bfd_nfp_arch;
+extern const bfd_arch_info_type bfd_nios2_arch;
 extern const bfd_arch_info_type bfd_ns32k_arch;
 extern const bfd_arch_info_type bfd_or1k_arch;
 extern const bfd_arch_info_type bfd_pdp11_arch;
@@ -765,6 +771,7 @@ static const bfd_arch_info_type * const bfd_archures_list[] =
     &bfd_mt_arch,
     &bfd_nds32_arch,
     &bfd_nfp_arch,
+    &bfd_nios2_arch,
     &bfd_ns32k_arch,
     &bfd_or1k_arch,
     &bfd_pdp11_arch,

bfd/bfd-in2.h

@@ -1719,6 +1719,7 @@ enum bfd_architecture
 #define bfd_mach_rx            0x75
 #define bfd_mach_rx_v2         0x76
 #define bfd_mach_rx_v3         0x77
+#define bfd_mach_rx_v3_dfpu    0x78
   bfd_arch_s390,      /* IBM s390.  */
 #define bfd_mach_s390_31       31
 #define bfd_mach_s390_64       64

bfd/cpu-rx.c

@@ -1,5 +1,5 @@
 /* BFD support for the RX processor.
-   Copyright (C) 2008-2024 Free Software Foundation, Inc.
+   Copyright (C) 2008-2025 Free Software Foundation, Inc.
 
    This file is part of BFD, the Binary File Descriptor library.
 
@@ -27,12 +27,13 @@
     bfd_default_compatible, bfd_default_scan,			\
     bfd_arch_default_fill, next, 0 }
 
-static const bfd_arch_info_type arch_info_struct[2] =
+static const bfd_arch_info_type arch_info_struct[4] =
 {
-  N (bfd_mach_rx_v2, "rx:v2", 3, false, arch_info_struct + 1),
-  N (bfd_mach_rx_v3, "rx:v3", 3, false, NULL)
+  N (bfd_mach_rx,    "rx",    3, false, arch_info_struct + 1),
+  N (bfd_mach_rx_v2, "rx:v2", 3, false, arch_info_struct + 2),
+  N (bfd_mach_rx_v3, "rx:v3", 3, false, arch_info_struct + 3),
+  N (bfd_mach_rx_v3_dfpu, "rx:v3", 3, false, NULL)
 };
 
 const bfd_arch_info_type bfd_rx_arch =
   N (bfd_mach_rx,    "rx",    4, true, arch_info_struct + 0);
-