[clang] [clang][ssaf] Implement JSONFormat (PR #180021)

[Balázs Benics via cfe-commits]

================
@@ -0,0 +1,973 @@
+#include "clang/Analysis/Scalable/Serialization/JSONFormat.h"
+#include "clang/Analysis/Scalable/TUSummary/TUSummary.h"
+
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/JSON.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Registry.h"
+
+using namespace clang::ssaf;
+
+//----------------------------------------------------------------------------
+// ErrorBuilder - Fluent API for constructing contextual errors
+//----------------------------------------------------------------------------
+
+namespace {
+
+class ErrorBuilder {
----------------
steakhal wrote:

I checked out and try myself. Makes sense now. `llvm::formatv` is weird. Why does it take raw `const char *Fmt`?...
Resolved.

https://github.com/llvm/llvm-project/pull/180021