Automerge: [yaml2obj] Apply output size limit to COFF (#209695)

Route the yaml2obj max-size setting through the COFF emitter and
buffer COFF output with ContiguousBlobAccumulator. This rejects
oversized YAML descriptions consistently with ELF.

Author: HaohaiWen

llvm/include/llvm/ObjectYAML/COFFYAML.h

@@ -26,6 +26,10 @@
 
 namespace llvm {
 
+namespace yaml {
+class ContiguousBlobAccumulator;
+}
+
 namespace COFF {
 
 inline Characteristics operator|(Characteristics a, Characteristics b) {
@@ -74,7 +78,7 @@ struct SectionDataEntry {
   std::optional<object::coff_load_configuration64> LoadConfig64;
 
   LLVM_ABI size_t size() const;
-  LLVM_ABI void writeAsBinary(raw_ostream &OS) const;
+  LLVM_ABI void writeAsBinary(yaml::ContiguousBlobAccumulator &CBA) const;
 };
 
 struct Section {

llvm/include/llvm/ObjectYAML/yaml2obj.h

@@ -70,7 +70,7 @@ using ErrorHandler = llvm::function_ref<void(const Twine &Msg)>;
 LLVM_ABI bool yaml2archive(ArchYAML::Archive &Doc, raw_ostream &Out,
                            ErrorHandler EH);
 LLVM_ABI bool yaml2coff(COFFYAML::Object &Doc, raw_ostream &Out,
-                        ErrorHandler EH);
+                        ErrorHandler EH, uint64_t MaxSize);
 LLVM_ABI bool yaml2goff(GOFFYAML::Object &Doc, raw_ostream &Out,
                         ErrorHandler EH);
 LLVM_ABI bool yaml2elf(ELFYAML::Object &Doc, raw_ostream &Out, ErrorHandler EH,