// FuncProps describes a set of function or method properties that may
// be useful for inlining heuristics. Here 'Flags' are properties that
// we think apply to the entire function; 'RecvrParamFlags' are
// properties of specific function params (or the receiver), and
// 'ResultFlags' are things properties we think will apply to values
// of specific results. Note that 'ParamFlags' includes and entry for