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81005af65f
Arm64EC uses a special name mangling mode that adds `$$h` between the symbol name and its type. In MSVC's name mangling `@` is used to separate the name and type BUT it is also used for other purposes, such as the separator between paths in a fully qualified name. The original algorithm was quite fragile and made assumptions that didn't hold true for all MSVC mangled symbols, so instead of trying to improve this algorithm we are now using the demangler to indicate where the insertion point should be (i.e., to parse the fully-qualified name and return the current string offset). Also fixed `isArm64ECMangledFunctionName` to search for `@$$h` since the `$$h` must always be after a `@`. Fixes #115231