Remove support for jemalloc

We only used it for measuring memory usage, but now we can use glibc's
allocator for that just fine

xtask/src/dist.rs

@@ -57,8 +57,6 @@ fn dist_server() -> Result<()> {
         env::set_var("CC", "clang");
         run!(
             "cargo build --manifest-path ./crates/rust-analyzer/Cargo.toml --bin rust-analyzer --release"
-            // We'd want to add, but that requires setting the right linker somehow
-            // --features=jemalloc
         )?;
     } else {
         run!("cargo build --manifest-path ./crates/rust-analyzer/Cargo.toml --bin rust-analyzer --release")?;

xtask/src/install.rs

@@ -24,7 +24,6 @@ pub struct ServerOpt {
 
 pub enum Malloc {
     System,
-    Jemalloc,
     Mimalloc,
 }
 
@@ -138,7 +137,6 @@ fn install_server(opts: ServerOpt) -> Result<()> {
 
     let malloc_feature = match opts.malloc {
         Malloc::System => "",
-        Malloc::Jemalloc => "--features jemalloc",
         Malloc::Mimalloc => "--features mimalloc",
     };
     let res = run!("cargo install --path crates/rust-analyzer --locked --force {}", malloc_feature);

xtask/src/main.rs

@@ -45,7 +45,6 @@ USAGE:
 FLAGS:
         --client-code    Install only VS Code plugin
         --server         Install only the language server
-        --jemalloc       Use jemalloc for server
         --mimalloc       Use mimalloc for server
     -h, --help           Prints help information
         "
@@ -62,15 +61,8 @@ FLAGS:
                 return Ok(());
             }
 
-            let malloc = match (args.contains("--jemalloc"), args.contains("--mimalloc")) {
-                (false, false) => Malloc::System,
-                (true, false) => Malloc::Jemalloc,
-                (false, true) => Malloc::Mimalloc,
-                (true, true) => {
-                    eprintln!("error: Cannot use both `--jemalloc` and `--mimalloc`");
-                    return Ok(());
-                }
-            };
+            let malloc =
+                if args.contains("--mimalloc") { Malloc::Mimalloc } else { Malloc::System };
 
             args.finish()?;