test: Fix some tests to run with musl

There were a few test cases to fix:

* Dynamic libraries are not supported with MUSL right now, so all of those
  related test which force or require dylibs are ignored.
* Looks like the default stack for MUSL is smaller than glibc, so a few stack
  allocations in benchmarks were boxed up (shouldn't have a perf impact).
* Some small linkage tweaks here and there
* Out-of-stack detection does not currently work with MUSL

src/test/bench/noise.rs

@@ -101,8 +101,8 @@ impl Noise2DContext {
 
 fn main() {
     let symbols = [' ', '░', '▒', '▓', '█', '█'];
-    let mut pixels = [0f32; 256*256];
-    let n2d = Noise2DContext::new();
+    let mut pixels = Box::new([0f32; 256*256]);
+    let n2d = Box::new(Noise2DContext::new());
 
     for _ in 0..100 {
         for y in 0..256 {

src/test/bench/shootout-reverse-complement.rs

@@ -50,17 +50,17 @@ use std::ptr::copy;
 use std::thread;
 
 struct Tables {
-    table8: [u8; 1 << 8],
-    table16: [u16; 1 << 16]
+    table8: Box<[u8; 1 << 8]>,
+    table16: Box<[u16; 1 << 16]>,
 }
 
 impl Tables {
     fn new() -> Tables {
-        let mut table8 = [0;1 << 8];
+        let mut table8 = Box::new([0;1 << 8]);
         for (i, v) in table8.iter_mut().enumerate() {
             *v = Tables::computed_cpl8(i as u8);
         }
-        let mut table16 = [0;1 << 16];
+        let mut table16 = Box::new([0;1 << 16]);
         for (i, v) in table16.iter_mut().enumerate() {
             *v = (table8[i & 255] as u16) << 8 |
                  table8[i >> 8]  as u16;

src/test/run-pass-fulldeps/issue-13560.rs

@@ -12,6 +12,7 @@
 // aux-build:issue-13560-2.rs
 // aux-build:issue-13560-3.rs
 // ignore-stage1
+// ignore-musl
 
 // Regression test for issue #13560, the test itself is all in the dependent
 // libraries. The fail which previously failed to compile is the one numbered 3.

src/test/run-pass/issue-12133-3.rs

@@ -11,6 +11,7 @@
 // aux-build:issue-12133-rlib.rs
 // aux-build:issue-12133-dylib.rs
 // aux-build:issue-12133-dylib2.rs
+// ignore-musl
 
 // pretty-expanded FIXME #23616
 

src/test/run-pass/linkage-visibility.rs

@@ -11,6 +11,7 @@
 // aux-build:linkage-visibility.rs
 // ignore-android: FIXME(#10379)
 // ignore-windows: std::dynamic_lib does not work on Windows well
+// ignore-musl
 
 #![feature(std_misc)]
 

src/test/run-pass/out-of-stack-new-thread-no-split.rs

@@ -8,11 +8,12 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//ignore-android
-//ignore-freebsd
-//ignore-ios
-//ignore-dragonfly
-//ignore-bitrig
+// ignore-android
+// ignore-freebsd
+// ignore-ios
+// ignore-dragonfly
+// ignore-bitrig
+// ignore-musl
 
 #![feature(asm)]
 

src/test/run-pass/sepcomp-extern.rs

@@ -14,8 +14,8 @@
 
 // Test accessing external items from multiple compilation units.
 
+extern crate sepcomp_extern_lib;
 
-#[link(name = "sepcomp_extern_lib")]
 extern {
     #[allow(ctypes)]
     fn foo() -> usize;