STData(SerialIter&) loaded a wire value into SerializedTypeID before
switching on it; an out-of-range value (65535) is undefined behaviour and
trips UBSan. Switch on the raw integer; the default branch already rejects
unknown types.

Skip the two WasmVMDeathTest cases under ENABLE_VOIDSTAR, which is a debug
build that does not abort on failed asserts, as BaseUintDeathTest does.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>