ELF: Reword a somewhat misleading error message.

PT_TLS is a type of program header, so we wouldn't expect to see
one in an object file. This error should probably be referring to
the fact that we didn't see a section with the flag SHF_TLS, which
would normally cause us to create a PT_TLS program header.

Differential Revision: https://reviews.llvm.org/D35395

llvm-svn: 307983
diff --git a/lld/ELF/Symbols.cpp b/lld/ELF/Symbols.cpp
index 1d17f57..c69007e 100644
--- a/lld/ELF/Symbols.cpp
+++ b/lld/ELF/Symbols.cpp
@@ -94,7 +94,7 @@
     if (D.isTls() && !Config->Relocatable) {
       if (!Out::TlsPhdr)
         fatal(toString(D.File) +
-              " has a STT_TLS symbol but doesn't have a PT_TLS section");
+              " has an STT_TLS symbol but doesn't have an SHF_TLS section");
       return VA - Out::TlsPhdr->p_vaddr;
     }
     return VA;