LLVM could kill the process during OSL PTX code generation, due
to generated symbols contained invalid characters in their name.
Those names are generated by Cycles and were not properly filtered:
- If the locale was set to something other than the minimal locale
(when Blender was built with WITH_INTERNATIONAL), pointers
may be printed with grouping characters, like commas or dots,
added to them.
- Material names from Blender may contain the full range of UTF8
characters.
This fixes those cases by forcing the locale used in the symbol name
generation to the minimal locale and using the material name hash
instead of the actual material name string.
6a8ce5ec1c