encodeNormals and compressTextureCoordinates broken when performing AO

[mramato]

If I enable encodeNormals or compressTextureCoordinates at the same time as passing aoOptions, I end up with two similar, but separate crashes:

Unhandled rejection TypeError: shader.replace is not a function
    at patchProgram (C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\octEncodeNormals.js:153:21)
    at C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\octEncodeNormals.js:94:21
    at C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\getAccessorsForSemantic.js:31:33
    at Promise._execute (C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\bluebird\js\release\debuggability.js:300:9)

Unhandled rejection TypeError: shader.replace is not a function
    at patchProgram (C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\compressTextureCoordinates.js:152:21)
    at C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\compressTextureCoordinates.js:90:21
    at C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\gltf-pipeline\lib\getAccessorsForSemantic.js:31:33
    at Promise._execute (C:\Git\AnalyticalGraphicsInc\agi-swayze\node_modules\bluebird\js\release\debuggability.js:300:9)