Mark more tests that rely on features unavailable on wasm32-wasip1 (or
in LLDB's Wasm support): expression evaluation (skipIfWasm), shared
libraries (skipIfTargetDoesNotSupportSharedLibraries), threads
(skipIfTargetDoesNotSupportThreads), and llvm-strip --keep-symbol, which
the Wasm object format doesn't support. Where a test also has supported,
passing cases, the decorator is applied per method.
The "expression" category is already skipped for Wasm, but that only
covers commands/expression/*, where the category is set by a
"categories" file. The tests in this PR live elsewhere and merely use
expression evaluation incidentally, so they aren't in that category and
need skipIfWasm directly.