glsl: reserve parameter storage on cache restore
glsl: reserve parameter storage on cache restore

Since we know how big the list will be we can allocate the storage
upfront.

Reviewed-by: Nicolai Hähnle <0d0be6cf5ad662651be2dc5dfd44aa2b09d4c1cc@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler