chore: fix stable build, move BranchTableTarget to FunctionData #454

Job	Run time
Build wasm	2m 57s
Run tests on Linux x86 (nightly, no default features)	49s
Run tests on Linux x86 (stable)	41s
Run tests on Linux x86 (nightly)	45s
Run tests on Linux armv7	2m 33s
Run tests on Linux arm64	2m 31s
Run tests on Linux x86 (stable, no default features)	37s
Run tests on macOS arm64 (Apple M1)	55s
	11m 48s

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