RISC-V: Fix ICE for target attributes has different xlen size

RISC-V: Fix ICE for target attributes has different xlen size

This patch would like to avoid the ICE when the target attribute
specific the xlen different to the cmd.  Aka compile with rv64gc
but target attribute with rv32gcv_zbb.  For example as blow:

   1   │ long foo (long a, long b)
   2   │ __attribute__((target("arch=rv32gcv_zbb")));
   3   │
   4   │ long foo (long a, long b)
   5   │ {
   6   │   return a + (b * 2);
   7   │ }

when compile with rv64gc -O3, it will have ICE similar as below

during RTL pass: fwprop1
test.c: In function ‘foo’:
test.c:10:1: internal compiler error: in add_use, at
rtl-ssa/accesses.cc:1234
   10 | }
      | ^
0x44d6b9d internal_error(char const*, ...)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/diagnostic-global-context.cc:517
0x44a26a6 fancy_abort(char const*, int, char const*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/diagnostic.cc:1722
0x408fac9 rtl_ssa::function_info::add_use(rtl_ssa::use_info*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/accesses.cc:1234
0x40a5eea
rtl_ssa::function_info::create_reg_use(rtl_ssa::function_info::build_info&,
rtl_ssa::insn_info*, rtl_ssa::resource_info)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/insns.cc:496
0x4456738
rtl_ssa::function_info::add_artificial_accesses(rtl_ssa::function_info::build_info&,
df_ref_flags)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/blocks.cc:900
0x4457297
rtl_ssa::function_info::start_block(rtl_ssa::function_info::build_info&,
rtl_ssa::bb_info*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/blocks.cc:1082
0x4453627
rtl_ssa::function_info::bb_walker::before_dom_children(basic_block_def*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/blocks.cc:118
0x3e9f3fb dom_walker::walk(basic_block_def*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/domwalk.cc:311
0x445806f rtl_ssa::function_info::process_all_blocks()
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/blocks.cc:1298
0x40a22d3 rtl_ssa::function_info::function_info(function*)
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/rtl-ssa/functions.cc:51
0x3ec3f80 fwprop_init
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/fwprop.cc:893
0x3ec420d fwprop
        /home/pli/gcc/111/riscv-gnu-toolchain/gcc/__RISC-V_BUILD__/../gcc/fwprop.cc:963
0x3ec43ad execute

Consider stage 4, we just report error for the above scenario when
detect the cmd xlen is different to the target attribute during the
target hook TARGET_OPTION_VALID_ATTRIBUTE_P implementation.

	PR target/118540

gcc/ChangeLog:

	* config/riscv/riscv-target-attr.cc (riscv_target_attr_parser::parse_arch):
	Report error when cmd xlen is different with target attribute.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/pr118540-1.c: New test.
	* gcc.target/riscv/rvv/base/pr118540-2.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>