[llvm] [gSYM] Add support merged functions in gSYM format (PR #101604)

[Greg Clayton via llvm-commits]

================
@@ -95,6 +95,7 @@ static uint64_t SegmentSize;
 static bool Quiet;
 static std::vector<uint64_t> LookupAddresses;
 static bool LookupAddressesFromStdin;
+static bool StoreMergedFunctionInfo;
----------------
clayborg wrote:

We should probably initialize these inline just in case.
```
static bool StoreMergedFunctionInfo = false;
```
I know the others aren't doing it, but it would be good to start. 

https://github.com/llvm/llvm-project/pull/101604