[Wasm Exceptions] Fix cfg-traversal on linking the basic block after a call #3594
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This was an unfortunate case of the order of execution of call
arguments.
link(self->currBasicBlock, self->startBasicBlock())wouldrun the call first, which sets
currBasicBlock, so we'd end up withthe same value for both parameters.
Without this fix, the testcase would
dropthe result of the call,as it thought it had no uses.
Also improve debug logging here a tiny bit.
Found by emscripten-core/emscripten#13485