[llvm] [llvm-objdump] Eliminate the dependency of `--mcpu=help` and `--mattr=help` on `-d` (PR #165661)

[James Henderson via llvm-commits]

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@@ -3533,6 +3533,35 @@ commaSeparatedValues(const llvm::opt::InputArgList &InputArgs, int ID) {
   return Values;
 }
 
+static void mcpuHelp() {
+  std::string Error;
+  Triple TheTriple;
+
+  if (!TripleName.empty()) {
+    TheTriple.setTriple(TripleName);
+  } else {
+    // If the target triple is derived from the files, we display help message
+    // when disassembling them.
+    if (Disassemble)
+      return;
+    if (InputFilenames.size() != 1)
+      reportWarning("When multiple files are specified, only the first file is "
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jh7370 wrote:

I thought that was obviously what I meant (though obviously you should make sure it's non-empty first). The existing behaviour is to look at the first object for the triple to print --mcpu=help when disassembling, so this shouldn't change for the case when we're not disassembling.

https://github.com/llvm/llvm-project/pull/165661