Ensure test doesn't run with llvm 3.9

Author: mrhota

src/rustllvm/RustWrapper.cpp

@@ -548,7 +548,6 @@ static unsigned fromRust(LLVMRustDIFlags Flags) {
   if (isSet(Flags & LLVMRustDIFlags::FlagRValueReference)) {
     Result |= DINode::DIFlags::FlagRValueReference;
   }
-#if LLVM_RUSTLLVM || LLVM_VERSION_GE(4, 0)
   if (isSet(Flags & LLVMRustDIFlags::FlagExternalTypeRef)) {
     Result |= DINode::DIFlags::FlagExternalTypeRef;
   }
@@ -558,6 +557,7 @@ static unsigned fromRust(LLVMRustDIFlags Flags) {
   if (isSet(Flags & LLVMRustDIFlags::FlagBitField)) {
     Result |= DINode::DIFlags::FlagBitField;
   }
+#if LLVM_RUSTLLVM || LLVM_VERSION_GE(4, 0)
   if (isSet(Flags & LLVMRustDIFlags::FlagNoReturn)) {
     Result |= DINode::DIFlags::FlagNoReturn;
   }

src/test/codegen/noreturnflag.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // ignore-tidy-linelength
-// min-llvm-version 3.8
+// min-llvm-version 4.0
 
 // compile-flags: -g -C no-prepopulate-passes
 
@@ -19,8 +19,6 @@ fn foo() -> ! {
     loop {}
 }
 
-// CHECK: {{.*}}DISubprogram{{.*}}name: "main",{{.*}}DIFlagMainSubprogram{{.*}}
-
 pub fn main() {
     foo();
 }