[Courgette] ELF: Fix abs32 / rel32 ordering in ParseFile() and restrict rel32 parsing to .text.

courgette/disassembler_elf_32.h

Index: courgette/disassembler_elf_32.h
diff --git a/courgette/disassembler_elf_32.h b/courgette/disassembler_elf_32.h
index 063c2e2cecec3f5ac354d85892784259954989e1..8793106957283890b19a70da4ba061410f4d6478 100644
--- a/courgette/disassembler_elf_32.h
+++ b/courgette/disassembler_elf_32.h
@@ -61,10 +61,15 @@ class DisassemblerElf32 : public Disassembler {
     virtual uint16_t op_size() const = 0;
 
     // Comparator for sorting, which assumes uniqueness of RVAs.
-    static bool IsLessThan(TypedRVA* a, TypedRVA* b) {
+    static bool IsLessThanByRVA(TypedRVA* a, TypedRVA* b) {
       return a->rva() < b->rva();
     }
 
+    // Comparator for sorting, which assumes uniqueness of file offsets.
+    static bool IsLessThanByFileOffset(TypedRVA* a, TypedRVA* b) {
+      return a->file_offset() < b->file_offset();
+    }
+
   private:
     const RVA rva_;
     RVA relative_target_ = kNoRVA;
@@ -163,6 +168,7 @@ class DisassemblerElf32 : public Disassembler {
 
   CheckBool CheckSection(RVA rva) WARN_UNUSED_RESULT;
 
+  // Extracts all rel32 TypedRVAs. Does not sort the result.
   CheckBool ParseRel32RelocsFromSections() WARN_UNUSED_RESULT;
 
   const Elf32_Ehdr* header_;