glsl/standalone: Enable par-linking

If the user did not request full linking, link the shader with the
built-in functions, inline them, and eliminate them.  Previous to this
you'd see all these calls to "dot" and "max" in the output.  This
prevented a lot of expected optimizations and cluttered the output.
This gives it some chance of being useful.

v2: Rebase on top of Ken's "built-ins now" work.

v3: Don't do_common_optimizations if par-linking fails.  Update expected
output of warnings tests to prevent 'make check' regressions.

v4: Optimize harder.  Most important, do function inlining.  Otherwise
it's quite impractical for one function in a file to call another
function in the same file.

v5: Add some code simplifications and an assertion suggested by Iago.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>

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