glsl_to_tgsi: add assertions for detecting out-of-bounds immediates access
glsl_to_tgsi: add assertions for detecting out-of-bounds immediates access

Reviewed-by: Brian Paul <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@vmware.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler