glsl-in: Fix the ternary operator to behave like an if #1877
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Fixes #1854
As pointed out in the issue, the glsl spec defines that only one of the expressions should be evaluated making the ternary operator syntactic sugar to an
if
.There are two commits that can be reviewed and tested separately, the first contains the actual fix and is the majority of the work. The seconds introduces a new method to the
Context
calledemit_restart
that performs a very common operation on the frontend of flushing the emitter and restarting it.