[clang] [lld] [lldb] [llvm] [Option] Replace the OptionTables object with a function. NFC (PR #224805)

[Fangrui Song via cfe-commits]

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@@ -159,7 +159,6 @@ class LLVM_ABI OptTable {
   struct Tables {
     const StringTable &StrTable;
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MaskRay wrote:

Agreed. Will do this along with 
"Derive the prefix union from the prefix table in the constructor and drop the emitted OptionPrefixesUnion."

https://github.com/llvm/llvm-project/pull/224805