Mark .eh_frame sections as live by default. NFC.

This change eliminates a string comparison from the
garbage collector.

llvm-svn: 256378
diff --git a/lld/ELF/InputSection.cpp b/lld/ELF/InputSection.cpp
index f28c87c..71078cf 100644
--- a/lld/ELF/InputSection.cpp
+++ b/lld/ELF/InputSection.cpp
@@ -253,7 +253,12 @@
 template <class ELFT>
 EHInputSection<ELFT>::EHInputSection(ObjectFile<ELFT> *F,
                                      const Elf_Shdr *Header)
-    : SplitInputSection<ELFT>(F, Header, InputSectionBase<ELFT>::EHFrame) {}
+    : SplitInputSection<ELFT>(F, Header, InputSectionBase<ELFT>::EHFrame) {
+  // Mark .eh_frame sections as live by default because there are
+  // usually no relocations that point to .eh_frames. Otherwise,
+ // the garbage collector would drop all .eh_frame sections.
+  this->Live = true;
+}
 
 template <class ELFT>
 bool EHInputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {