glsl: Refactor variable declaration handling.

Moving the check for an earlier variable declaration helps cleanly
separate out the re-declaration vs. new declaration code a bit.  With
that in place, conflicts between variable names and structure types or
function names aren't caught by the earlier "redeclaration" error
message, so check the return type on glsl_symbol_table::add_variable
and issue an error there.  If one occurs, don't emit the initializer.

Fixes redeclaration-01.vert and redeclaration-09.vert.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

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