ltoplugin: analyze MethodByName names through bounded loops

[zhouguangyuan0718]

Summary

• analyze MethodByName names loaded through bounded loop indices, including direct range values
• recover names from constant string arrays and local array literals lowered to alloca/store/load sequences
• keep the analysis conservative when local memory has unknown writes or escapes
• cover loop, caller-parameter propagation, and [...]string{const...} range cases in the LTO tests

The local composite literal case was not handled before because ABI lowering produced a local string array initialized by constant stores, while the pass only folded loads from global initializers.

Validation

• full TestBuildAndCheckSymbolsFromTestltoLTOPlugin
• full TestRunAndTestFromTestltoLTOPlugin

Both pass with the rebuilt LTO plugin, and the new test confirms that Query, Mutation, and Subscription are retained while Drop is eliminated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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