Fix TypeComparator to satisfy C++'s Compare requirement (#3650)

The comparison implemented by TypeComparator was not previously antisymmetric
because it held that both A < B and B < A when A and B were structurally
identical but nominally distinct recursive types. This meant that it did not
satisfy the conditions of C++'s "Compare" requirement, which meant that std::set
did not operate correctly, as discovered in #3648. The PR fixes the problem by
having making A < B be false (and vice versa), making type comparisons properly
antisymmetric.

As a drive by, also switches to using std::stable_sort in collectHeapTypes to
make the order of the type section completely deterministic accross platforms.

Fixes #3648.

0 files changed, 0 insertions, 0 deletions