Revert r356738 "[llvm-objcopy] - Implement replaceSectionReferences for GroupSection class."

Seems this broke ubsan bot:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-ubsan/builds/11760

llvm-svn: 356745

llvm/test/tools/llvm-objcopy/ELF/Inputs/compress-debug-sections.yaml

@@ -25,23 +25,6 @@ Sections:
   - Name:            .debug_bar
     Type:            SHT_PROGBITS
     Content:         0000000000000000
-  - Name:            .group
-    Type:            SHT_GROUP
-    Link:            .symtab
-    EntSize:         0x0000000000000004
-    Info:            groupname
-    Members:         
-      - SectionOrType:   GRP_COMDAT
-      - SectionOrType:   .text.in.group
-      - SectionOrType:   .debug_in_group
-  - Name:            .text.in.group
-    Type:            SHT_PROGBITS
-    Flags:           [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
-    Content:         '00'
-  - Name:            .debug_in_group
-    Type:            SHT_PROGBITS
-    Flags:           [ SHF_GROUP ]
-    Content:         '00'
 Symbols:
   Global:
     - Name:    .debug_foo
@@ -52,6 +35,4 @@ Symbols:
       Section: .notdebug_foo
     - Name:    .Linfo_string0
       Section: .debug_bar
-    - Name:    groupname
-      Section: .group
 ...

llvm/test/tools/llvm-objcopy/ELF/compress-debug-sections-groups.test

@@ -1,53 +0,0 @@
-# REQUIRES: zlib
-
-## In this test, we check how llvm-objcopy handles compression/decompression
-## of debug sections included in a COMDAT group.
-
-# RUN: yaml2obj %p/Inputs/compress-debug-sections.yaml -o %t.o
-
-## Check compression of debug sections.
-# RUN: llvm-objcopy --compress-debug-sections %t.o %t-compressed.o
-# RUN: llvm-readobj -s -elf-section-groups %t-compressed.o | \
-# RUN:   FileCheck %s --check-prefixes=CHECK,COMPRESS
-
-## Check zlib-gnu compression of debug sections.
-# RUN: llvm-objcopy --compress-debug-sections=zlib-gnu %t.o %t-compressed-gnu.o
-# RUN: llvm-readobj -s -elf-section-groups %t-compressed-gnu.o | \
-# RUN:   FileCheck %s --check-prefixes=CHECK,COMPRESSZLIB
-
-## Check decompression of debug sections.
-# RUN: llvm-objcopy --decompress-debug-sections %t-compressed.o %t-decompressed.o
-# RUN: llvm-readobj -elf-section-groups %t-decompressed.o | \
-# RUN:   FileCheck %s --check-prefixes=CHECK,DECOMPRESS
-
-## Check decompression of zlib-gnu debug sections.
-# RUN: llvm-objcopy --decompress-debug-sections %t-compressed-gnu.o %t-decompressed-gnu.o
-# RUN: llvm-readobj -elf-section-groups %t-decompressed-gnu.o | \
-# RUN:   FileCheck %s --check-prefixes=CHECK,DECOMPRESS
-
-# COMPRESSZLIB:      Name: .zdebug_in_group
-# COMPRESSZLIB-NEXT: Type: SHT_PROGBITS
-# COMPRESSZLIB-NEXT: Flags [
-# COMPRESSZLIB-NEXT:   SHF_GROUP
-# COMPRESSZLIB-NEXT: ]
-
-# COMPRESS:      Name: .debug_in_group
-# COMPRESS-NEXT: Type: SHT_PROGBITS
-# COMPRESS-NEXT: Flags [
-# COMPRESS-NEXT:   SHF_COMPRESSED
-# COMPRESS-NEXT:   SHF_GROUP
-# COMPRESS-NEXT: ]
-
-# CHECK:           Group {
-# CHECK-NEXT:        Name: .group
-# CHECK-NEXT:        Index:
-# CHECK-NEXT:        Link:
-# CHECK-NEXT:        Info:
-# CHECK-NEXT:        Type: COMDAT
-# CHECK-NEXT:        Signature: groupname
-# CHECK-NEXT:        Section(s) in group [
-# CHECK-NEXT:          .text.in.group
-# COMPRESSZLIB-NEXT:   .zdebug_in_group
-# COMPRESS-NEXT:       .debug_in_group
-# DECOMPRESS-NEXT:     .debug_in_group
-# CHECK-NEXT:        ]

llvm/tools/llvm-objcopy/ELF/Object.cpp

@@ -689,13 +689,6 @@ void GroupSection::markSymbols() {
     Sym->Referenced = true;
 }
 
-void GroupSection::replaceSectionReferences(
-    const DenseMap<SectionBase *, SectionBase *> &FromTo) {
-  for (SectionBase *&Sec : GroupMembers)
-    if (SectionBase *To = FromTo.lookup(Sec))
-      Sec = To;
-}
-
 void Section::initialize(SectionTableRef SecTable) {
   if (Link != ELF::SHN_UNDEF) {
     LinkSection =

llvm/tools/llvm-objcopy/ELF/Object.h

@@ -633,8 +633,6 @@ public:
   void finalize() override;
   Error removeSymbols(function_ref<bool(const Symbol &)> ToRemove) override;
   void markSymbols() override;
-  void replaceSectionReferences(
-      const DenseMap<SectionBase *, SectionBase *> &FromTo) override;
 
   static bool classof(const SectionBase *S) {
     return S->Type == ELF::SHT_GROUP;