Implement IR-level translation of system values for GLSL (#413)

The approach here isn't ideal. We already have a pass that transforms HLSL varying input/output types into GLSL global variables. This change makes it so that when those inputs/outputs have system-value semantics, we generate a global variable declaration with the appropriate `gl_*` name (leaving the type the same for now). Later, when emitting code, we just skip emitting declarations for declarations with mangled names that start with `gl_*`.

A more complete implementation will be needed later on, which handles cases where the translation requires types to be changed (so that conversion code needs to be inserted).

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