Currently we already have tools to extract C++ symbols of d8, and output the
statistics result. This patch creates two scripts, one is to use exsisting tools
to extract C++ symbols and dump to output, the other collects all symbols and
merges them into v8 log. The format of C++ symbols in v8 log is:
cpp,start_address,size,symbol_name
BUG=v8:4906
LOG=n
Review-Url: https://codereview.chromium.org/1884493003
Cr-Commit-Position: refs/heads/master@{#35841}
