[Bug c++/29215] New: Can't find nested type under strange circumstances (outer namespace or unrelated code built without debug info)

["dblaikie at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29215

            Bug ID: 29215
           Summary: Can't find nested type under strange circumstances
                    (outer namespace or unrelated code built without debug
                    info)
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: dblaikie at gmail dot com
  Target Milestone: ---

a.cpp:
```
void f1();
int main() {
  f1();
}
```
b.cpp:
```
namespace x {
struct t1 {
  t1();
  struct t2 {
    t2();
  };
};
}
x::t1::t1() { }
x::t1::t2::t2() { }
void f1() { }
```
Build the first without debug info, and the second with debug info and
pubnames/gdb-index:
```
$ clang++ -c a.cpp
$ clang++ -c b.cpp -g -ggnu-pubnames -Wl,--gdb-index
$ clang++ a.o b.o -fuse-ld=lld 
$ gdb -ex "ptype x::t1::t2" -ex "ptype x::t1" -ex quit a.out
No type "t1" within class or namespace "x".
type = struct x::t1 {
...
```
But if you add `-g -ggnu-pubnames` to a.cpp, or if you remove the namespace,
the name lookups do seem to work.

(reproduces with GCC-built DWARF too)

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