Speculative fix for the swift/Linux CGFloat formatter
Speculative fix for the swift/Linux CGFloat formatter

Register a summary provider for Foundation.CGFloat. This is a
speculative fix for a swift/Linux bot failure:

URL:
https://ci.swift.org/view/swift-master-next/job/oss-lldb-incremental-linux-ubuntu-16_04-master-next/5391

AssertionError: False is not True : 'frame variable -- point' returns
expected result, got:

  '(NSPoint) point = (x = Foundation.CGFloat @ 0x00007ffcac323c60, y = Foundation.CGFloat @ 0x00007ffcac323c68)'

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb