Piecewise should be compileable

The package I want to suggest the idea to: AngouriMath

Piecewise should be compiled in a chain of if else if else....

@Rafael-SOWNet

@Rafael-SOWNet This isn't about the Provided node, this is about the Piecewise node. It was an incorrect test.

Simplify the intersection #415 actually asks for, and fix two wrong t…

Piecewise compiles on current master:

var f = "piecewise(x provided x > 0, 0 provided x <= 0)".ToEntity().Compile<double, double>("x");
f(2)  =>  2
f(-2) =>  0

Closing. Matrix is still uncompilable, which is #425 / #526.

Works on master:

var f = "piecewise(x provided x > 0, 0 provided x <= 0)".ToEntity().Compile<double, double>("x");
f(2)   =>  2
f(-2)  =>  0

Piecewise compiles to the stack machine and picks the first branch whose predicate holds. Closing.

Matrix compilation is still unsupported and is tracked separately in #425 / #526.

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