[5.5][SILGen] Allow capturing local wrapped properties.

[hborla]

Cherry-pick of #37464

• Explanation: Property wrappers on local variables were new in Swift 5.4, and in Swift 5.5 property wrappers are allowed on parameters as well. This is the first kind of local computed property to have synthesized accessors that capture other variables, rather than accessors that are explicitly written by the programmer. The compiler's implementation of computing and emitting local captures in SILGen relied on accessors being parsed rather than synthesized. So, transitive captures in local property wrapper accessors were not properly emitted when the wrapped variable is captured in a closure, leading to cryptic/bogus compiler errors because the backing property wrapper storage was not captured in the closure. The fix is simply to use synthesized accessors to compute transitive captures for wrapped variables in a local context.
• Scope: The scope is limited to property wrappers on local variables and parameters that are captured in closures.
• Risk: Very low.
• Testing: Added several SILGen tests to exercise capturing local property wrappers and wrapped parameters.
• Reviewer: @slavapestov

Resolves: rdar://74457878

[hborla]

@swift-ci please test

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - 8409ac4

[hborla]

@swift-ci please test Linux platform