This Emscripten version was the first to be cut after the LLVM 11
release branch was created, so it should be the most compatible with
LLVM 11. The old version we were using was incompatible with LLVM 11
because its wasm-ld did not understand all the relocations that LLVM
11 emits.

push_all_move is the same as extend

All other tokens are named by the punctuation they use, rather than
by semantics operation they stand for. `!` is the only exception to
the rule, let's fix it.

Already covered by MIR constant comments

Move to intra-doc links for task.rs and vec.rs

Partial fix for rust-lang#75080

links for [`get`], [`get_mut`] skipped due to rust-lang#75643
link for [`copy_from_slice`] skipped due to rust-lang#63351

…kfire

Clean up E0759 explanation

r? @Dylan-DPC

cc @pickfire

Enable stack-overflow detection on musl for non-main threads

Fix bad printing of const-eval queries

Fixes: rust-lang#75447

r? @RalfJung

cc @oli-obk

… r=cuviper

Upgrade Emscripten on CI to 1.39.20

This Emscripten version was the first to be cut after the LLVM 11
release branch was created, so it should be the most compatible with
LLVM 11. The old version we were using was incompatible with LLVM 11
because its wasm-ld did not understand all the relocations that LLVM
11 emits.

…onst, r=oli-obk

Suppress ty::Float in MIR comments of ty::Const

Already covered by MIR constant comments

Remove duplicated alloc vec bench push_all_move

push_all_move is the same as extend

Rename rustc_lexer::TokenKind::Not to Bang

All other tokens are named by the punctuation they use, rather than
by semantics operation they stand for. `!` is the only exception to
the rule, let's fix it.