Revert "[DWARF] - Make collectAddressRanges() return section index in addition to Low/High PC"

Broked BB again:

TEST 'LLVM :: DebugInfo/X86/dbg-value-regmask-clobber.ll' FAILED
...
LLVM ERROR: Section was outside of section table.

llvm-svn: 303984

llvm/lib/Object/WasmObjectFile.cpp

@@ -743,10 +743,6 @@ std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec,
 
 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; }
 
-uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const {
-  return Sec.d.a;
-}
-
 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const {
   const WasmSection &S = Sections[Sec.d.a];
   return S.Content.size();