Auto merge of #55660 - alexcrichton:cleanup-alloc-system, r=dtolnay,SimonSapin

Remove the `alloc_system` crate

In what's hopefully one of the final nails in the coffin of the "old allocator story of yore" this PR deletes the `alloc_system` crate and all traces of it from the compiler. The compiler no longer needs to inject allocator crates anywhere and the `alloc_system` crate has no real reason to exist outside the standard library.

The unstable `alloc_system` crate is folded directly into the standard library where its stable interface, the `System` type, remains the same. All unstable traces of `alloc_system` are removed, however.

1 files changed, 0 insertions, 19 deletions

diff --git a/src/liballoc_system/Cargo.toml b/src/liballoc_system/Cargo.toml
deleted file mode 100644
index c34e2f203a8..00000000000
--- a/src/liballoc_system/Cargo.toml
+++ /dev/null
@@ -1,19 +0,0 @@
-[package]
-authors = ["The Rust Project Developers"]
-name = "alloc_system"
-version = "0.0.0"
-
-[lib]
-name = "alloc_system"
-path = "lib.rs"
-test = false
-doc = false
-
-[dependencies]
-core = { path = "../libcore" }
-libc = { path = "../rustc/libc_shim" }
-compiler_builtins = { path = "../rustc/compiler_builtins_shim" }
-
-# See comments in the source for what this dependency is
-[target.'cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))'.dependencies]
-dlmalloc = { path = "../rustc/dlmalloc_shim" }