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When printing the root of a value, if it's a reference its children are unconditionally
printed - in contrast to pointers whose children are only printed if a sufficient
pointer depth is given.
However, the children are printed even when there's a summary provider that says not to.
If a summary provider exists, this change consults it to determine if children should be
printed.
For example, given a variable of type `std::string &`, this change has the following
effect:
Before:
```
(lldb) p string_ref
(std::string &) string_ref = "one two three four five six seven eight nine ten": {
__r_ = {
std::__1::__compressed_pair_elem<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__rep, 0, false> = {
__value_ = {
= {
__l = (__data_ = "one two three four five six seven eight nine ten", __size_ = 48, __cap_ = 64, __is_long_ = 1)
__s = (__data_ = "@\0p\U00000001\0`\0\00\0\0\0\0\0\0\0@", __padding_ = "\x80t<", __size_ = '\0', __is_long_ = '\x01')
__r = {
__words ={...}
}
}
}
}
}
}
```
After:
```
(lldb) p string_ref
(std::string &) string_ref = "one two three four five six seven eight nine ten"
```
rdar://73248786
Differential Revision: https://reviews.llvm.org/D151748
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