COFF: Improve section hash value.

std::distance(C->Relocs.end(), C->Relocs.begin()) is the same as NumRelocs
which is already added to the hash value. What we are missing here is the
section size.

llvm-svn: 248202

lld/COFF/ICF.cpp

@@ -86,7 +86,7 @@ uint64_t ICF::getHash(SectionChunk *C) {
                       hash_value(C->SectionName),
                       C->NumRelocs,
                       uint32_t(C->Header->SizeOfRawData),
-                      std::distance(C->Relocs.end(), C->Relocs.begin()),
+                      uint32_t(C->Header->SizeOfRawData),
                       C->Checksum);
 }