[cfe-commits] Switching assert(0/false to llvm_unreachable

[David Blaikie]

As per recent discussions on cfe-commits, here's a patch to change all
sure-failing assertions to llvm_unreachables (this task was made easier by
the canonicalization of these asserts that Richard's been doing with the new
boolean conversion from string warning - which meant there were only two
major cases ("assert(0 &&" and "assert(false &&" - I don't think I found any
message-less asserts in clang though I think there are some in LLVM
itself)). The only other thing I had to do was some 80 col wraps due to the
increase in length.

If this is the right thing just say the word & I'll check it in.
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