Add T-HEAD's RISC-V CPU E906, Support E906(rv32imac), E906F(rv32imafc),E906FD(rv32imafdc) #344
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[New CPU]Add Alibaba T-HEAD's RISC-V CPU E906, Support E906(rv32imac), E906F(rv32imafc),E906FD(rv32imafdc)
Description
T-head Semiconductor Co., Ltd. (Alibaba), the latest commercial RISCV CPU series, The same code, supports 3 types isa: rv32imac, rv32imafc, rv32imafdc. Between different isa, separated by the built-in macro(__riscv_flen) of the toolchain.
Test Steps
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