[llvm] [llvm-objdump] Add triple support to `mcpu=help` (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 DummyTriple;
+
+  if (!TripleName.empty())
+    DummyTriple.setTriple(TripleName);
+  else {
+    // If the target triple is derived from the files, we display help message
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jh7370 wrote:

I think you should check again, because that isn't what I've seen. I've done that exact combination, using an x86_64 object file and a recent `main` llvm-objdump build. When --triple=x86_64 is specified, both disassembly and help use x86_64 as the target, whereas when using --triple=arm, it uses arm.

I also feel like we've had this discussion multiple times now.

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