Remove bogus std::error_code returns form SectionRef.

There are two methods in SectionRef that can fail:

* getName: The index into the string table can be invalid.
* getContents: The section might point to invalid contents.

Every other method will always succeed and returning and std::error_code just
complicates the code. For example, a section can have an invalid alignment,
but if we are able to get to the section structure at all and create a
SectionRef, we will always be able to read that invalid alignment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219314 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-cov/TestingSupport.cpp

@@ -67,11 +67,10 @@ int convert_for_testing_main(int argc, const char **argv) {
     return 1;
 
   // Get the contents of the given sections.
+  uint64_t ProfileNamesAddress = ProfileNames.getAddress();
   StringRef CoverageMappingData;
-  uint64_t ProfileNamesAddress;
   StringRef ProfileNamesData;
   if (CoverageMapping.getContents(CoverageMappingData) ||
-      ProfileNames.getAddress(ProfileNamesAddress) ||
       ProfileNames.getContents(ProfileNamesData))
     return 1;