[llvm] CloneFunction: Do not delete blocks with address taken (PR #134209)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> (I think technically it is legal to ignore the blockaddress in this case, because it is only specified to be meaningful in conjunction with indirectbr, 

For the ultimate usage, but it still needs to be passed around as an opaque value to be delivered to an eventual indirectbr use. The langref also says you can use as an inlineasm operand 

https://github.com/llvm/llvm-project/pull/134209