[clang-tools-extra] [clang-doc] add ftime profiling (PR #97644)

[Paul Kirth via cfe-commits]

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@@ -99,6 +100,16 @@ URL of repository that hosts code.
 Used for links to definition locations.)"),
                   llvm::cl::cat(ClangDocCategory));
 
+static llvm::cl::opt<bool> FTimeTrace("ftime-trace", llvm::cl::desc(R"(
+Turn on time profiler. Generates clang-doc-tracing.json)"),
+                                      llvm::cl::init(false),
+                                      llvm::cl::cat(ClangDocCategory));
+
+static llvm::cl::opt<int> FTimeGranularity("ftime-gran", llvm::cl::desc(R"(
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ilovepi wrote:

```suggestion
static llvm::cl::opt<int> FTimeGranularity("ftime-granularity", llvm::cl::desc(R"(
```
I haven't seen this used elsewhere, is it common in other components? I think its more typical to pick/set the granularity for a tool as a constant. Even if we keep it, it should be a hidden option.

https://github.com/llvm/llvm-project/pull/97644