wasm: fix benchmarks when using non-V8 Wasm runtime. (#15214)
wasm: fix benchmarks when using non-V8 Wasm runtime. (#15214)

While there, rename all tests executed on WasmVMs to "WasmSpeedTest",
so that it's easier to compare results across runtimes using existing
tools (e.g. compare.py).

Signed-off-by: Piotr Sikora <ba6f3a1a6d7e1ecae91b31e93969cc392fbd0fdd@google.com>
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