Rollup of 12 pull requests

[Manishearth]

Successful merges:

• Add lazy initialization primitives to std #72414 ( Add lazy initialization primitives to std)
• Compare tagged/niche-filling layout and pick the best one #74069 (Compare tagged/niche-filling layout and pick the best one)
• compiletest: Rewrite extract_*_version functions #74237 (compiletest: Rewrite extract_*_version functions)
• ci: Set shell: bash as a default, remove duplicates #74418 (ci: Set shell: bash as a default, remove duplicates)
• bootstrap.py: patch RPATH on NixOS to handle the new zlib dependency. #74441 (bootstrap.py: patch RPATH on NixOS to handle the new zlib dependency.)
• Add regression test for #69414 #74444 (Add regression test for ICE -Zsave-analysis: const-param-type-depends-on-type-param-ungated.rs #69414)
• improper_ctypes_definitions: allow Box #74448 (improper_ctypes_definitions: allow Box)
• Test codegen of compare_exchange operations #74449 (Test codegen of compare_exchange operations)
• Fix Safety docs for from_raw_parts_mut #74450 (Fix Safety docs for from_raw_parts_mut)
• Use intra-doc links in str and BTreeSet #74453 (Use intra-doc links in str and BTreeSet)
• rustbuild: drop tool::should_install #74457 (rustbuild: drop tool::should_install)
• Use pathdiff crate #74464 (Fix for Use pathdiff crate for path_relative_from #67108 )

Failed merges:

r? @ghost

[Manishearth]

@rustbot modify labels: +rollup
@bors r+ rollup=never p=5

[bors]

📌 Commit 4076f9a has been approved by Manishearth

[bors]

🌲 The tree is currently closed for pull requests below priority 5, this pull request will be tested once the tree is reopened

[bors]

⌛ Testing commit 4076f9a with merge 20a450b939c0ca5a0bf1d2d653fe4000703d15f7...

[bors]

💔 Test failed - checks-actions

[Manishearth]

@rustbot modify labels: +rollup
@bors r+ rollup=never p=5

[bors]

📌 Commit fa885e8 has been approved by Manishearth

[bors]

⌛ Testing commit fa885e8 with merge 141cf9d64cfc13829d1355e0ed9280bfa903a5e7...

[bors]

💔 Test failed - checks-actions

[Manishearth]

2020-07-18T01:04:45.6911067Z 
2020-07-18T01:04:45.6911563Z Breakpoint 1, pretty_std_collections::main::h1ef1d7ce5967b6a7 () at /checkout/obj/build/tmp/distcheck/src/test/debuginfo/pretty-std-collections.rs:140
2020-07-18T01:04:45.6911702Z 140	    zzz(); // #break
2020-07-18T01:04:45.6911819Z $1 = {map = {root = {<No data fields>}, length = 15}}
2020-07-18T01:04:45.6911942Z $2 = {map = {root = {<No data fields>}, length = 0}}
2020-07-18T01:04:45.6912060Z $3 = {root = {<No data fields>}, length = 15}
2020-07-18T01:04:45.6912175Z $4 = {root = {<No data fields>}, length = 0}
2020-07-18T01:04:45.6912289Z $5 = {root = {<No data fields>}, length = 2}
2020-07-18T01:04:45.6912402Z $6 = {root = {<No data fields>}, length = 15}
2020-07-18T01:04:45.6912622Z $7 = {tail = 0, head = 3, buf = {ptr = {pointer = 0x5555557a15e0, _marker = {<No data fields>}}, cap = 8, alloc = {<No data fields>}}}
2020-07-18T01:04:45.6912805Z $8 = {tail = 1, head = 0, buf = {ptr = {pointer = 0x5555557a1610, _marker = {<No data fields>}}, cap = 8, alloc = {<No data fields>}}}
2020-07-18T01:04:45.6912981Z $9 = {base = {hash_builder = {__0 = {<No data fields>}}, table = {bucket_mask = 7, ctrl = {pointer = 0x5555557a16e0 "\377"}, data = {pointer = 0x5555557a16f8}, growth_left = 3, items = 4, marker = {<No data fields>}}}}
2020-07-18T01:04:45.6913168Z $10 = {map = {base = {hash_builder = {__0 = {<No data fields>}}, table = {bucket_mask = 7, ctrl = {pointer = 0x5555557a1680 "\377"}, data = {pointer = 0x5555557a1698}, growth_left = 3, items = 4, marker = {<No data fields>}}}}}
2020-07-18T01:04:45.6913310Z A debugging session is active.
2020-07-18T01:04:45.6913380Z 
2020-07-18T01:04:45.6913483Z 	Inferior 1 [process 36447] will be killed.
2020-07-18T01:04:45.6913561Z 
2020-07-18T01:04:45.6913668Z Quit anyway? (y or n) [answered Y; input not from terminal]
2020-07-18T01:04:45.6913728Z 
2020-07-18T01:04:45.6913985Z ------------------------------------------
2020-07-18T01:04:45.6914095Z stderr:
2020-07-18T01:04:45.6914313Z ------------------------------------------
2020-07-18T01:04:45.6914389Z 
2020-07-18T01:04:45.6914604Z ------------------------------------------
2020-07-18T01:04:45.6914675Z 
2020-07-18T01:04:45.6914719Z 
2020-07-18T01:04:45.6914777Z 
2020-07-18T01:04:45.6914873Z failures:
2020-07-18T01:04:45.6915103Z     [debuginfo-gdb] debuginfo/function-call.rs
2020-07-18T01:04:45.6915338Z     [debuginfo-gdb] debuginfo/pretty-huge-vec.rs
2020-07-18T01:04:45.6915581Z     [debuginfo-gdb] debuginfo/pretty-std-collections.rs
2020-07-18T01:04:45.6915829Z     [debuginfo-gdb] debuginfo/pretty-uninitialized-vec.rs
2020-07-18T01:04:45.6915909Z 
2020-07-18T01:04:45.6916176Z test result: �[31mFAILED�(B�[m. 71 passed; 4 failed; 41 ignored; 0 measured; 0 filtered out
2020-07-18T01:04:45.6916323Z