Reframe the preprocessor as a C++ class, with instances, removing all C code, removing all global variables.  Upgrade bison version to pass a parse context on through to the preprocessor.  All the basic things to make something thread safe.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22291 e7fa87d3-cd2b-0410-9028-fcbf551c1848