[wasm] Reimplement jiterpreter float-to-int conversions (#81923)

[wasm] Reimplement jiterpreter float-to-int conversions (#81923)

Reimplement float-to-int conversions in the jiterpreter by generating a series of conditional checks that match what clang does, in order to work around the wasm conversion opcode being unspecified for nan/inf.
Fix bug in jiterpreter instrumentation that would suppress the dumped module blob and error message if an unhandled error occurred while generating a block.
Fixes #81900