utils: fix demangle_full to only demangle mangled C++ symbols #1780
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Currently, uftrace demangles all symbols, regardless of whether they are mangled C++ symbols or unmangled C symbols.
But when setting --demangle=full, uftrace calls __cxa_demangle(), which translates unmangled symbols confusingly; e.g., "f" is translated to "float".
To address this, now we only call __cxa_demangle() if a symbol is mangled (starts with "_Z").
Fixed #1778