Fix gapidfuzz support of vertex and compute shaders (#232)
Fix gapidfuzz support of vertex and compute shaders (#232)

* Fix test of empty string

* Avoid painful characters in shader filenames

* Undo renaming of shader filenames

We must keep the name of the dumped resource to be able to replace
it later on.

* Fix support of vertex and compute shaders

google/graphicsfuzz,google/graphicsfuzz,google/graphicsfuzz,google/graphicsfuzz,google/graphicsfuzz,google/graphicsfuzz,google/graphicsfuzz