It might be interesting to see how many parameters with entry_value locations there are compared to how many parameters-with-location there are overall.

I can clean up this patch and push it forward if there's general interest. Here are some numbers from a stage2 RelAsserts build of clang.

~/src/builds/llvm-project-master-stage2-RA (0) $ ../llvm-project-master-RA/bin/llvm-dwarfdump --statistics ./bin/clang.dSYM | ppjson { 'call site entries': 6113835, 'file': 'bin/clang.dSYM/Contents/Resources/DWARF/clang', 'formal params with binary location': 5928235, 'formal params with binary location containing entry value': 0, 'formal params with source location': 4200769, 'formal params with type': 8436986, 'format': 'Mach-O 64-bit x86-64', 'inlined funcs with abstract origins': 5859344, 'inlined functions': 5859344, 'scope bytes covered': 563026378, 'scope bytes total': 969630990, 'source functions': 468524, 'source functions with location': 468075, 'source variables': 10246465, 'total formal params': 8436986, 'total function size': 65502932, 'total inlined function size': 48065586, 'total vars': 1142370, 'unique source variables': 1408162, 'variables with location': 6751342, 'vars with binary location': 710703, 'vars with source location': 1059166, 'vars with type': 1142370, 'version': 3} (with -femit-debug-entry-values) ~/src/builds/param-entry-vals-stage2 (0) $ ../llvm-project-master-RA/bin/llvm-dwarfdump --statistics ./bin/clang.dSYM | ppjson { 'call site entries': 6471968, 'file': 'bin/clang.dSYM/Contents/Resources/DWARF/clang', 'formal params with binary location': 5928218, 'formal params with binary location containing entry value': 70017, 'formal params with source location': 4200754, 'formal params with type': 8437413, 'format': 'Mach-O 64-bit x86-64', 'inlined funcs with abstract origins': 5859331, 'inlined functions': 5859331, 'scope bytes covered': 580573865, 'scope bytes total': 969629704, 'source functions': 468520, 'source functions with location': 468071, 'source variables': 10246437, 'total formal params': 8437413, 'total function size': 65502621, 'total inlined function size': 48065442, 'total vars': 1142364, 'unique source variables': 1408152, 'variables with location': 6751217, 'vars with binary location': 710704, 'vars with source location': 1059160, 'vars with type': 1142364, 'version': 3}