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Use protected visibility when building rustc with LLD #139758

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Job	Run time
Calculate job matrix	10s
PR - mingw-check	35m 24s
PR - mingw-check-tidy	8m 13s
PR - x86_64-gnu-llvm-18	1h 20m 6s
PR - x86_64-gnu-tools	34m 54s
bors build finished	0s
	2h 38m 47s