[ELF] .llvm.call-graph-profile: support CREL

https://reviews.llvm.org/D105217 added RELA support. This patch adds
CREL support.

Author: MaskRay

lld/ELF/Driver.cpp

@@ -1003,6 +1003,15 @@ processCallGraphRelocations(SmallVector<uint32_t, 32> &symbolIndices,
   for (size_t i = 0, e = objSections.size(); i < e; ++i) {
     const Elf_Shdr_Impl<ELFT> &sec = objSections[i];
     if (sec.sh_info == inputObj->cgProfileSectionIndex) {
+      if (sec.sh_type == SHT_CREL) {
+        auto crels =
+            CHECK(obj.crels(sec), "could not retrieve cg profile rela section");
+        for (const auto &rel : crels.first)
+          symbolIndices.push_back(rel.getSymbol(false));
+        for (const auto &rel : crels.second)
+          symbolIndices.push_back(rel.getSymbol(false));
+        break;
+      }
       if (sec.sh_type == SHT_RELA) {
         ArrayRef<typename ELFT::Rela> relas =
             CHECK(obj.relas(sec), "could not retrieve cg profile rela section");

lld/test/ELF/cgprofile-rela.test

@@ -8,6 +8,10 @@
 # RUN: ld.lld --no-call-graph-profile-sort %t.o -o %t
 # RUN: llvm-nm --no-sort %t | FileCheck %s --check-prefix=NO-CG
 
+# RUN: yaml2obj -DTYPE=SHT_CREL %s -o %tcrel.o
+# RUN: ld.lld --call-graph-profile-sort=hfsort %tcrel.o -o %t
+# RUN: llvm-nm --no-sort %t | FileCheck %s
+
 # CHECK: 0000000000201124 t D
 # CHECK: 0000000000201122 t C
 # CHECK: 0000000000201128 t B
@@ -60,7 +64,7 @@ Sections:
       - Weight: 30
       - Weight: 90
   - Name: .rela.llvm.call-graph-profile
-    Type: SHT_RELA
+    Type: [[TYPE=SHT_RELA]]
     Info: .llvm.call-graph-profile
     Relocations:
       - Offset: 0x0