radv: Call nir_lower_constant_initializers.
radv: Call nir_lower_constant_initializers.

Port of c5d664f9dc2d281c74844cef36ecb9f5862a8f6a
"anv/pipeline: Call nir_lower_constant_initializers"

Signed-off-by: Bas Nieuwenhuizen <56a798a1342712831422e083524d42df749f5e84@google.com>
Cc: <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Reviewed-by: Timothy Arceri <5dd83789ef3714029244367ba1ca09f1d7627408@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler