bump minimum LLVM version to 5.0

src/test/run-pass/thinlto/all-crates.rs

@@ -10,7 +10,6 @@
 
 // compile-flags: -Clto=thin
 // no-prefer-dynamic
-// min-llvm-version 4.0
 
 fn main() {
     println!("hello!");

src/test/run-pass/thinlto/dylib-works.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 // aux-build:dylib.rs
-// min-llvm-version 4.0
 
 extern crate dylib;
 

src/test/run-pass/thinlto/msvc-imp-present.rs

@@ -10,7 +10,6 @@
 
 // aux-build:msvc-imp-present.rs
 // compile-flags: -Z thinlto -C codegen-units=8
-// min-llvm-version: 4.0
 // no-prefer-dynamic
 
 // On MSVC we have a "hack" where we emit symbols that look like `_imp_$name`

src/test/run-pass/thinlto/thin-lto-inlines.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 // compile-flags: -Z thinlto -C codegen-units=8 -O
-// min-llvm-version 4.0
 // ignore-emscripten can't inspect instructions on emscripten
 
 // We want to assert here that ThinLTO will inline across codegen units. There's

src/test/run-pass/thinlto/thin-lto-inlines2.rs

@@ -10,7 +10,6 @@
 
 // compile-flags: -C codegen-units=8 -O -C lto=thin
 // aux-build:thin-lto-inlines-aux.rs
-// min-llvm-version 4.0
 // no-prefer-dynamic
 // ignore-emscripten can't inspect instructions on emscripten
 

src/test/run-pass/thinlto/weak-works.rs

@@ -10,7 +10,6 @@
 
 // compile-flags: -C codegen-units=8 -Z thinlto
 // ignore-windows
-// min-llvm-version 4.0
 
 #![feature(linkage)]