Enable stack-probe tests with system LLVM >= 5.0

Author: cuviper

src/test/codegen/stack-probes.rs

@@ -15,7 +15,7 @@
 // ignore-wasm
 // ignore-emscripten
 // ignore-windows
-// no-system-llvm
+// min-system-llvm-version 5.0
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type = "lib"]

src/test/run-pass/stack-probes-lto.rs

@@ -15,7 +15,7 @@
 // ignore-emscripten no processes
 // ignore-musl FIXME #31506
 // ignore-pretty
-// no-system-llvm
+// min-system-llvm-version 5.0
 // compile-flags: -C lto
 // no-prefer-dynamic
 

src/test/run-pass/stack-probes.rs

@@ -14,7 +14,7 @@
 // ignore-cloudabi no processes
 // ignore-emscripten no processes
 // ignore-musl FIXME #31506
-// no-system-llvm
+// min-system-llvm-version 5.0
 
 use std::mem;
 use std::process::Command;

src/tools/compiletest/src/header.rs

@@ -167,7 +167,7 @@ impl EarlyProps {
                         .expect("Malformed llvm version directive");
                     // Ignore if using system LLVM and actual version
                     // is smaller the minimum required version
-                    !(config.system_llvm && &actual_version[..] < min_version)
+                    config.system_llvm && &actual_version[..] < min_version
                 } else {
                     false
                 }