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Save only callee-saved registers in pcb

Description

Save only callee-saved registers in pcb

On AArch64, registers x9-x18 are not callee-saved, yet they are
preserved at many placed in swtch.S. This patch removes code that
preserves these registers.

Details

Provenance
peter_dpgao.ccAuthored on May 25 2022, 10:25 AM
andrewCommitted on May 25 2022, 10:26 AM
Parents
rG9e0716f46101: Add arm64 CnP support
Branches
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