Update outdated LLVM comment

Author: clubby789

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -192,10 +192,7 @@ impl<'a> IntoIterator for LLVMFeature<'a> {
 // to LLVM or the feature detection code will walk past the end of the feature
 // array, leading to crashes.
 //
-// To find a list of LLVM's names, check llvm-project/llvm/include/llvm/Support/*TargetParser.def
-// where the * matches the architecture's name
-//
-// For targets not present in the above location, see llvm-project/llvm/lib/Target/{ARCH}/*.td
+// To find a list of LLVM's names, see llvm-project/llvm/lib/Target/{ARCH}/*.td
 // where `{ARCH}` is the architecture name. Look for instances of `SubtargetFeature`.
 //
 // Beware to not use the llvm github project for this, but check the git submodule