TreeBorrows: Put accesses diagnostic parameters into a single struct #12391

Job	Run time
style checks	5m 10s
test (aarch64-unknown-linux-gnu)	19m 41s
coverage report	5m 51s
test (i686-unknown-linux-gnu)	20m 7s
test (i686-pc-windows-msvc)	24m 42s
test (riscv64gc-unknown-linux-gnu)	15m 41s
test (armv7-unknown-linux-gnueabihf)	17m 11s
test (x86_64-unknown-linux-gnu)	21m 1s
test (aarch64-pc-windows-msvc)	20m 32s
test (aarch64-apple-darwin)	26m 3s
bootstrap build	2m 51s
automatic pull from rustc	0s
conclusion	4s
cronjob failure notification	0s
	2h 58m 54s

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