Top-level multi-variable single declaration with closure bug

[joehinkle11]

Description
Initializing multiple top-level variables in a single declaration where the all the initializations are immediately invoked closures causes the later variables' initialization to be overridden by the first's.

Steps to reproduce
Make a simple Swift Package with two files.

// main.swift
print(x) // prints "x" as expected
print(y) // prints "x" when "y" was expected

// other.swift
let x = {return "x"}(), y = {return "y"}()

Screenshots

Environment

• Swift compiler version info: swift-driver version: 1.62.15 Apple Swift version 5.7.2 (swiftlang-5.7.2.135.5 clang-1400.0.29.51)
  Target: arm64-apple-macosx13.0
• Xcode version info: Xcode 14.2 Build version 14C18
• Deployment target: Mac

[jckarter]

The mangler mangles both closures with the same symbol name $s4fooo1xSSvpfiSSyXEfU_ "closure #1 in variable initialization expression of x", causing the closure for initializing y to never get emitted because we pick up the one for x in its stead.