Currently, the default name for wasm functions in generated code is 'wasm', tag wasm functions with the index into the function table to identify functions. Snippets of sample output with --print-code below.

Before:
--- Code ---
kind = WASM_FUNCTION
name = wasm
compiler = turbofan

After:
--- Code ---
kind = WASM_FUNCTION
name = wasm#200
compiler = turbofan

R=mtrofin@chromium.org

Review-Url: https://codereview.chromium.org/2690113012
Cr-Commit-Position: refs/heads/master@{#43296}