[PATCH] RISC-V: Report error if function declare with different

[Kito Cheng]

Hi all:

This patch implemented TARGET_MERGE_DECL_ATTRIBUTES hook to check the
interrupter is all compatible, tested with rv32ima and rv64ima elf
toolchain.

gcc/ChangeLog
2018-07-06  Kito Cheng  <kito.cheng@gmail.com>

        * config/riscv/riscv.c (enum riscv_privilege_levels): Add UNKNOWN_MODE.
        (riscv_expand_epilogue): Add more assertion to check interrupt mode.
        (riscv_set_current_function): Extract getting interrupt type to new
        function.
        (riscv_get_interrupt_type): New function.
        (riscv_merge_decl_attributes): New function, checking interrupt type is
        same.
        (TARGET_MERGE_DECL_ATTRIBUTES): Define.

gcc/testsuite/ChangeLog
2018-07-06  Kito Cheng  <kito.cheng@gmail.com>

        * gcc.target/riscv/interrupt-conflict-mode.c: New.
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