[pull] swiftwasm-release/5.8 from release/5.8 #5257
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… no-return func
The pass is attempting to diagnose any user-written code that appears
after the result of no-return function call. It has to skip any
instructions that happen after the no-return call but are associated
with it, such as `alloc_stack` to pass result of such call indirectly.
This helps to avoid extraneous diagnostics for synthesized code i.e.
a result builder with `buildExpression`:
```
static func buildExpression<T>(_ e: T) -> T { e }
```
The following example would produce extraneous warning:
```
switch <value> {
case ...
default: fatalError()
}
```
because it is translated into:
```
switch <value> {
case ...
default: {
var $__builderDefault = buildExpression(fatalError())
$__builderSwitch = buildEither(second: $__builderDefault)
}
}
```
In such cases all instructions that follow `fatalError()` call
are synthesized except to `alloc_stack $Never` which is passed
to `buildExpression`, that instruction is anchored on the
`fatalError()` itself which is where the diagnostic would point,
which is incorrect.
Resolves: rdar://104775183
(cherry picked from commit afaeca7)
* `var description` * `func ==` * `func hasSameSourceLocation(as:)` (cherry picked from commit d96ef3b)
[5.8][SILOptimizer] Don't diagnose unreachable instructions that belong to…
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