Rollup merge of rust-lang#28193 - dhuseby:fixing_bitrig_alloc_crate_tests, r=alexcrichton

@alexcrichton this will get the bitrig buildbot back to green.

Author: Manishearth

src/test/compile-fail/allocator-dylib-is-system.rs

@@ -10,6 +10,7 @@
 
 // ignore-msvc everything is the system allocator on msvc
 // ignore-musl no dylibs on musl yet
+// ignore-bitrig no jemalloc on bitrig
 // aux-build:allocator-dylib.rs
 // no-prefer-dynamic
 // error-pattern: cannot link together two allocators

src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs

@@ -10,6 +10,7 @@
 
 // ignore-msvc everything is the system allocator on msvc
 // ignore-musl no dylibs on musl right now
+// ignore-bitrig no jemalloc on bitrig
 // aux-build:allocator-dylib2.rs
 // error-pattern: cannot link together two allocators
 

src/test/run-pass/allocator-default.rs

@@ -10,9 +10,9 @@
 
 #![feature(alloc_jemalloc, alloc_system)]
 
-#[cfg(not(target_env = "msvc"))]
+#[cfg(not(any(target_env = "msvc", target_os = "bitrig")))]
 extern crate alloc_jemalloc;
-#[cfg(target_env = "msvc")]
+#[cfg(any(target_env = "msvc", target_os = "bitrig"))]
 extern crate alloc_system;
 
 fn main() {

src/test/run-pass/allocator-jemalloc.rs

@@ -10,6 +10,7 @@
 
 // no-prefer-dynamic
 // ignore-msvc no jemalloc on msvc
+// ignore-bitrig no jemalloc on bitrig either
 
 #![feature(alloc_jemalloc)]