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Shadow stack is part of Intel's Control-Flow Enforcement Technology (CET). Whenever a function is called, the return address is pushed onto both the regular stack and the shadow stack. When that function returns, the return addresses are popped off both stacks and compared; if they fail to match, #CP raised. With this commit, we create shadow stack for each fiber context and switch the shadow stack accordingly during fcontext switch. Signed-off-by: Chen, Hu <hu1.chen@intel.com> Closes GH-9283.