[SR-13223] Fix C++ debug type deserialization.

[zoecarver]

Previous ID	SR-13223
Radar	rdar://problem/83423221
Original Reporter	@zoecarver
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, CxxInterop
Assignee	None
Priority	Medium

md5: e7f23df26e35dbbf4e8ddc5f9c5cfec4

Issue Description:

When we try to emit debug info for C++ types we crash because we can't deserialize them.

Here's an example program (that crashes):

// RUN: swift-frontend -enable-cxx-interop -I %S/Inputs %s -emit-ir -g

// IntBox.cpp

struct IntBox { int x; };

// Main.swift

func blackHole<T>(_ x : T) -> T { x }

public func create(_ x : Int32) -> IntBox { IntBox(x: x) }

public func test() {
  let f = create(Int32.random(in: 0..<6))
  _  = blackHole(f)
}

[gribozavr]

PR32815 disabled generation of debug info for C++ types as a workaround.

[zoecarver]

@swift-ci create