Add runtime benchmark cachegrind diff #1695
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Instead use the `rustc-demangle` crate to demangle Rust symbols.
This avoids the creation of needless `cgfilt` files when comparing two Cachegrind profiles. It also produces a demangled `cgout` file even without using Cachegrind diff.
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This PR adds the ability to compare two Cachegrind profiles of a runtime benchmark using
cg_diff. It also refactors similar functionality for compile time benchmarks, to allow reusing the implementation and remove some unneeded temporary files. The need to have an externalrustfiltbinary installed was also removed, demangling is now performed using therustc-demanglecrate.