[ELF] - Linkerscript: make section with no content to be SHT_PROGBITS by default.

Imagine next script:

SECTIONS { BYTE(0x11); }

Section content written to disk will be 0x11. Previous LLD behavior was to make this
section SHT_NOBITS. What is not correct because section has content.
ld.bfd makes such sections SHT_PROGBITS, this patch do the same.

This fixes PR32537

Differential revision: https://reviews.llvm.org/D32016

llvm-svn: 300317
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 5a9e465..ab2ca22 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -632,7 +632,7 @@
   // '.' is assigned to, but creating these section should not have any bad
   // consequeces and gives us a section to put the symbol in.
   uint64_t Flags = SHF_ALLOC;
-  uint32_t Type = SHT_NOBITS;
+  uint32_t Type = SHT_PROGBITS;
   for (BaseCommand *Base : Opt.Commands) {
     auto *Cmd = dyn_cast<OutputSectionCommand>(Base);
     if (!Cmd)