gallivm: Fix build since llvm-3.7.0svn r234460.
gallivm: Fix build since llvm-3.7.0svn r234460.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89963
Signed-off-by: Vinson Lee <25a259f709b0f1b620605d2518271a846d8826e5@freedesktop.org>
Reviewed-by: Tom Stellard <85590917cb30a670bf23f5b4273617f8815d1e87@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler