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Save registers that the function destroys, but that the ABI says should be preserved across function calls.
extern(C++) void prolog_saveregs (
.backend .codebuilder .CodeBuilder cdb,
) nothrow @trusted;
Emit Dwarf info for these saves.
|cdb||append generated instructions to this|
|topush||mask of registers to push|
|cfa_offset||offset of frame pointer from CFA|