[WebAssembly] Object: Improve error messages on invalid section

[tlively]

Might be nice to have a test, but understandable if that doesn't seem worth the effort.

[sbc100]

• add test]

llvm/lib/Object/WasmObjectFile.cpp

case wasm::WASM_SEC_ELEM:
     return parseElemSection(Ctx);
   case wasm::WASM_SEC_CODE:
     return parseCodeSection(Ctx);
   case wasm::WASM_SEC_DATA:
     return parseDataSection(Ctx);
   case wasm::WASM_SEC_DATACOUNT:
     return parseDataCountSection(Ctx);
   default:
-    return make_error<GenericBinaryError>("Bad section type",
-                                          object_error::parse_failed);
+    return make_error<GenericBinaryError>(
+        "Invalid section type: " + Twine(Sec.Type), object_error::parse_failed);
   }
 }
 
 Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) {
   // See https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md
   HasDylinkSection = true;
   DylinkInfo.MemorySize = readVaruint32(Ctx);
   DylinkInfo.MemoryAlignment = readVaruint32(Ctx);