This removes all includes of src/wasm from src/deoptimizer, by #if'ing
out wasm-related parts. This will allow to later exclude the whole
src/wasm directory from compilation.

Drive-by: Inline DecodeWasmReturnKind and EncodeWasmReturnKind to avoid
more #ifs.

R=jgruber@chromium.org

Bug: v8:11238
Change-Id: Ia49ed26fc217b3e80756a363dcd397d9060f6835
Cq-Include-Trybots: luci.v8.try:v8_linux64_no_wasm_compile_rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2739653Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73261}