[ELF] SHF_MERGE: avoid Fatal

In LLD_IN_TEST=2 mode, when a thread calls Fatal, there will be no
output even if the process exits with code 1.

Author: MaskRay

lld/ELF/InputFiles.cpp

@@ -700,13 +700,12 @@ bool ObjFile<ELFT>::shouldMerge(const Elf_Shdr &sec, StringRef name) {
   if (entSize == 0)
     return false;
   if (sec.sh_size % entSize)
-    Fatal(ctx) << this << ":(" << name << "): SHF_MERGE section size ("
-               << uint64_t(sec.sh_size)
-               << ") must be a multiple of sh_entsize (" << entSize << ")";
-
+    ErrAlways(ctx) << this << ":(" << name << "): SHF_MERGE section size ("
+                   << uint64_t(sec.sh_size)
+                   << ") must be a multiple of sh_entsize (" << entSize << ")";
   if (sec.sh_flags & SHF_WRITE)
-    Fatal(ctx) << this << ":(" << name
-               << "): writable SHF_MERGE section is not supported";
+    Err(ctx) << this << ":(" << name
+             << "): writable SHF_MERGE section is not supported";
 
   return true;
 }

lld/test/ELF/invalid/merge-invalid-size.s

@@ -1,6 +1,6 @@
 // REQUIRES: x86
 // RUN: llvm-mc %s -o %t.o -filetype=obj -triple=x86_64-pc-linux
-// RUN: not ld.lld %t.o -o /dev/null 2>&1 | FileCheck %s
+// RUN: not ld.lld %t.o -o /dev/null --noinhibit-exec 2>&1 | FileCheck %s
 // CHECK: merge-invalid-size.s.tmp.o:(.foo): SHF_MERGE section size (2) must be a multiple of sh_entsize (4)
 
 .section .foo,"aM",@progbits,4

lld/test/ELF/invalid/merge-writable.s

@@ -1,6 +1,7 @@
 // REQUIRES: x86
 // RUN: llvm-mc %s -o %t.o -filetype=obj -triple=x86_64-pc-linux
 // RUN: not ld.lld %t.o -o /dev/null 2>&1 | FileCheck %s
+// RUN: ld.lld %t.o -o /dev/null --noinhibit-exec 2>&1 | FileCheck %s
 // CHECK: merge-writable.s.tmp.o:(.foo): writable SHF_MERGE section is not supported
 
 .section .foo,"awM",@progbits,4