vc4: Fix handling of UBO range offsets.
vc4: Fix handling of UBO range offsets.

The ranges are in units of bytes, not dwords.  This wasn't caught by
piglit tests because ttn tends to make one big uniform file, so we only
had one UBO range with a src and dst offset of 0.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler