[MERGED] warning 24X: redundant code: switch control expression is constant

[Daniel-Cortez]

What this PR does / why we need it:

This PR allows the compiler to warn the user about redundant code if a switch control expression has a constant result, as suggested in #528.

switch (1) // warning 24X: redundant code: switch control expression is constant
{
    // ...
}

There are already similar warnings for if, while, do-while and for statements ("205: redundant code: constant expression is zero" and "206: redundant test: constant expression is non-zero"), so I think it should make sense to adopt a similar warning for switch.

Which issue(s) this PR fixes:

Fixes #

What kind of pull this is:

• A Bug Fix
• A New Feature
• Some repository meta (documentation, etc)
• Other

Additional Documentation: