Recommit [Object] Change object::SectionRef::getContents() to return Expected<StringRef>

r360876 didn't fix 2 call sites in clang.

Expected<ArrayRef<uint8_t>> may be better but use Expected<StringRef> for now.

Follow-up of D61781.

llvm-svn: 360892
diff --git a/llvm/tools/llvm-readobj/ObjDumper.cpp b/llvm/tools/llvm-readobj/ObjDumper.cpp
index 15facef..4f73cbd 100644
--- a/llvm/tools/llvm-readobj/ObjDumper.cpp
+++ b/llvm/tools/llvm-readobj/ObjDumper.cpp
@@ -73,8 +73,7 @@
     error(E);
   W.startLine() << "String dump of section '" << SectionName << "':\n";
 
-  StringRef SectionContent;
-  Section.getContents(SectionContent);
+  StringRef SectionContent = unwrapOrError(Section.getContents());
 
   const uint8_t *SecContent = SectionContent.bytes_begin();
   const uint8_t *CurrentWord = SecContent;
@@ -107,8 +106,7 @@
     error(E);
   W.startLine() << "Hex dump of section '" << SectionName << "':\n";
 
-  StringRef SectionContent;
-  Section.getContents(SectionContent);
+  StringRef SectionContent = unwrapOrError(Section.getContents());
   const uint8_t *SecContent = SectionContent.bytes_begin();
   const uint8_t *SecEnd = SecContent + SectionContent.size();