[Bug] Tree-Shaking is not working properly

[nev21]

Describe the bug
Consuming the latest version of the library 0.10.2 results in the following code being left behind in @nevware21/ts-async

var arrIndexOf = _unwrapFunction(INDEX_OF, ArrProto);
    _unwrapFunction(LAST_INDEX_OF, ArrProto);

    var arrSlice = _unwrapFunction(SLICE, ArrProto);

    var fnCall = _unwrapInstFunction(CALL);

Where the LAST_INDEX_OF (which is not used), is not getting tree-shaken from the build

To Reproduce
Steps to reproduce the behavior:

1. Clone '@nevware21/ts-async`
2. Rebuild and review the dist/es5/amd/ts-async.js (actually most of the formats not just amd)
3. See unreferenced functions / properties not getting tree-shaken out of the generated code

Expected behavior
The unused functions should get tree-shaken out of existence in the consuming modules

[MSNev]

Issue is still occurring for some "other" usages, specifically in ApplicationInsights for the strSymSplit function

var strSplit = _unwrapFunction("split", StrProto);
hasSymbol() ? _unwrapFunction("split", StrProto) : polyStrSymSplit;

Trialing some local "fixes", it's possible to suppress this further by tagging the hasSymbol with the /*#__NO_SIDE_EFFECTS__*/ so that rollup knows that when it's not referenced it can be dropped.

[MSNev]

Please add this to all of the "accessor" functions like getXXX(), hasXXX() when they don't have any side-effects as the package.json sideEffects: false doesn't always work.