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* [RISCV] Correct the CallPreservedMask for the function call in an interrupt ↵Shiva Chen2020-02-201-0/+70
handler CallPreservedMask is used to describe the register liveness after a function call. The function call in an interrupt handler should use the same CallPreservedMask as normal functions. So that only callee save registers can live through the function call. (cherry picked from commit 1cae2f9d192c69833e22684ca338660942ab464e)
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