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Adds the ability to lookup and display all merged functions for an
address in llvm-gsymutil.
Now, when `--merged-functions` is used in combination with
`--address/--addresses-from-stdin`, lookup results will contain
information about merged functions, if available.
To support printing merged function information when using the
`--verbose` option, the `LookupResult` data structure also had to be
extended with pointers to the raw function data and raw merged function
data. This is because merged functions share the same address range, so
it's not easy to look up the raw merged function data for a particular
`LookupResult` that is based on a merged function.
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GSYM/MergedFunctionsInfo.h
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This patch introduces support for storing debug info for merged
functions in the GSYM debug info. It allows GSYM to represent multiple
functions that share the same address range, which occur when multiple
functions are merged during linker ICF.
The core of this functionality is the new `MergedFunctionsInfo` class,
which is integrated into the existing `FunctionInfo` structure. During
GSYM creation, functions with identical address ranges are now grouped
together, with one function serving as the "master" and the others
becoming "merged" functions. This organization is preserved in the GSYM
format and can be read back and displayed when dumping GSYM information.
Old readers will only see the master function, and ther "merged"
functions will not be processed.
Note: This patch just adds the functionality to the gSYM format -
additional changes to the gsym format and algorithmic changes to logic
existing tooling are needed to take advantage of this data.
Exact output of `llvm-gsymutil --verify --verbose` for the included
test:
[gist](https://gist.github.com/alx32/b9c104d7f87c0b3e7b4171399fc2dca3)
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