Formatting of multiple `ClassImp()` definitions

[tdealtry]

Running the current clang-format file on a file with

ClassImp(RooTrackerVtxBase)
ClassImp(JNuBeamFlux)

produces a line like

ClassImp(RooTrackerVtxBase) ClassImp(JNuBeamFlux)

which brings up a weird compilation error

I'm guessing (unconfirmed) that we can get around this using semi-colons

ClassImp(RooTrackerVtxBase);
ClassImp(JNuBeamFlux);

But that has its own issues...

/opt/hk-ToolApp/UserTools/ImportedTools/GHOST-WCSim/OriginalWCSim/src/TJNuBeamFlux.cc:108:28: warning: extra ‘;’ -Wpedantic]
 ClassImp(RooTrackerVtxBase);
                            ^
/opt/hk-ToolApp/UserTools/ImportedTools/GHOST-WCSim/OriginalWCSim/src/TJNuBeamFlux.cc:109:22: warning: extra ‘;’ -Wpedantic]
 ClassImp(JNuBeamFlux);

For reference, here is the definition from ROOTs Rtypes.h, which explains why the semicolon is not a good idea

#define ClassImpUnique(name,key) \
   namespace ROOT { \
      TGenericClassInfo *GenerateInitInstance(const name*); \
      namespace { \
         static int _R__UNIQUE_(_NAME2_(R__dummyint,key)) __attribute__((unused)) = \
            GenerateInitInstance((name*)0x0)->SetImplFile(__FILE__, __LINE__); \
         R__UseDummy(_R__UNIQUE_(_NAME2_(R__dummyint,key))); \
      } \
   }
#define ClassImp(name) ClassImpUnique(name,default)

Any ideas on how to stop clang-format mangling this?