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Ret from for-loop block sometimes generated bad LLVM bitcode #2142

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@marijnh

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@marijnh

This is somewhat subtle, in that I haven't been able to reproduce it in small toy programs, but I had to make several changes to loops to make things compile as part of the switch to new-style loops (#1619). The error you get is about an unterminated block.

See for example

c902eaf#L1R92
c902eaf#L49R1649

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    A-codegenArea: Code generationI-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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