Fixed clang warnings in generated C++ code #2502

Job	Run time
check-diff / check	18s
check-diff / check	18s
check-labels / check	2s
check-labels / check	3s
lsp / test-lsp (ubuntu-latest)	8m 3s
lsp / test-lsp (ubuntu-latest)	8m 3s
cli / test-cli (ubuntu-latest)	3m 11s
cli / test-cli (ubuntu-latest)	3m 11s
building / build-toolchain (ubuntu-latest)	5m 7s
building / build-toolchain (ubuntu-latest)	5m 7s
building / epoch / build-epoch	5m 38s
building / epoch / build-epoch	5m 38s
	44m 39s

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