feat: add riscv64 architecture support

[Zeno-sole]

add riscv64 architecture support

Log:

[Zeno-sole]

Macro definitions in riscv64 environment in gcc and clang

#define __riscv 1
#define __riscv_a 2000000
#define __riscv_arch_test 1
#define __riscv_atomic 1
#define __riscv_c 2000000
#define __riscv_cmodel_medlow 1
#define __riscv_compressed 1
#define __riscv_d 2000000
#define __riscv_div 1
#define __riscv_f 2000000
#define __riscv_fdiv 1
#define __riscv_flen 64
#define __riscv_float_abi_double 1
#define __riscv_fsqrt 1
#define __riscv_i 2000000
#define __riscv_m 2000000
#define __riscv_mul 1
#define __riscv_muldiv 1
#define __riscv_xlen 64

[deepin-bot]

TAG Bot

New tag: 0.7.6
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #390

[deepin-bot]

TAG Bot

New tag: 0.7.7
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #394

[deepin-bot]

TAG Bot

New tag: 0.7.8
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #401

[Zeno-sole]

/retest

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, Zeno-sole

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