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0112936ef7
Taking a leaf out of the LLVM code base: this macro still includes an assert(false) so that the message will show up in a typical build, but it follows it up with a call to a function explicitly marked as no- return. So this ought to do a better job of convincing compilers that once a code path hits this function it _really doesn't_ have to still faff about with making up a bogus return value or filling in a variable that 'might be used uninitialised' in the following code that won't be reached anyway. I've gone through the existing code looking for the assert(false) / assert(0) idiom and replaced all the ones I found with the new macro, which also meant I could remove a few pointless return statements and variable initialisations that I'd already had to put in to placate compiler front ends.