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arch: arc: add handling for accl regs, r25, r30
* when fpu is configured or mpy_option > 6, accl regs (r58, r59) will be configured, they are used by fpu and mac, and are caller -saved scratch regs, so need to be saved before jumping to interrupt handlers * r25 and r30 are also caller-saved scratch reg. Signed-off-by: Wayne Ren <email@example.com>
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