Earlier, more comprehensive check for constant initializers (#88)

This commit checks *during elaboration* that initializers for global
variables or local static variables are compile-time constants.

Before this commit, some non-constant initializers were detected
later in the C2C pass, but others were eliminated by the Cleanup
pass before being checked, and yet others could cause the Rename pass
to abort.

To determine which variables are constant l-values, we leverage
the recent addition of the Storage_auto storage class and base
the determination on the storage class of the identifier:
'auto' or 'register' is not constant, the others are constant.

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