[LLVM] Update handling of default runtime targets #136591
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Summary:
This patch changes the handling for
defaultin the LLVM runtimes list.Currently it's some different path, but I think it's more
straightforward if we have everything go through the same handling and
just semantically replace
defaultwith the target LLVM is building for(current behavior).
The one thing that this changes I'm aware of is that instead of
something like
ninja check-libcwe now haveninja check-libc-x86_64-unknown-linux-gnu. This will almost surely break somebots with hard-coded check projects, so I'm thinking the easiest
solution is to always define the
check-<runtime>and every time weadd a specific target, it adds itself as a dependency to the global
check-<runtime>.