ir_function_signature::constant_expression_value computes results from builtin functions when given constant arguments. Problem is, it either duplicates the code from ir_expression::constant_expression_value or the function definitions from builtins/ir/*. So this patch instead "runs" the definition from ir/*, leaving the computations to ir_expression. Part of the complexity of this not very complex series comes from wanting to be able to run builtins including temporaries such as transpose or inverse. This allows to test such functions through glsl_compiler --dump-lir before hooking up the gl side.
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