[lld] [AArch64][GCS][LLD] Introduce -zgcs-report-dynamic Command Line Option (PR #127787)

[Peter Smith via llvm-commits]

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@@ -569,6 +576,58 @@ static GcsPolicy getZGcs(Ctx &ctx, opt::InputArgList &args) {
   return ret;
 }
 
+static GcsReportPolicy getZGcsReport(Ctx &ctx, opt::InputArgList &args) {
+  GcsReportPolicy ret = GcsReportPolicy::None;
+
+  for (auto *arg : args.filtered(OPT_z)) {
+    std::pair<StringRef, StringRef> kv = StringRef(arg->getValue()).split('=');
+    if (kv.first == "gcs-report") {
+      arg->claim();
+      if (kv.second == "none")
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smithp35 wrote:

It may be worth trying a StringSwitch to see if it looks cleaner. There are some examples of StringSwitch use in Driver.cpp 

https://github.com/llvm/llvm-project/pull/127787