Rollup merge of #138073 - tmiasko:inline-asm-critical-edges, r=bjorn3

Break critical edges in inline asm before code generation

An inline asm terminator defines outputs along its target edges -- a
fallthrough target and labeled targets. Code generation implements this
by inserting code directly into the target blocks. This approach works
only if the target blocks don't have other predecessors.

Establish required invariant by extending existing code that breaks
critical edges before code generation.

Fixes #137867.

r? ``@bjorn3``

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