[llvm-readobj] - An attemp to fix BB.

BB failed:
http://lab.llvm.org:8011/builders/clang-armv7-linux-build-cache/builds/15062/steps/build%20stage%201/logs/stdio

Error was:
/home/buildslave/buildslave/clang-armv7-linux-build-cache/llvm/tools/llvm-readobj/ELFDumper.cpp:3540:7:
error: non-constant-expression cannot be narrowed from type 'llvm::support::detail::packed_endian_specific_integral<unsigned long long,
llvm::support::endianness::little, 1>::value_type' (aka 'unsigned long long') to 'size_t' (aka 'unsigned int') in initializer list [-Wc++11-narrowing]
      StrTabSec->sh_size};

llvm-svn: 362084
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 1aea493..1012cf1 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -3524,7 +3524,7 @@
   const Elf_Shdr *StrTabSec = unwrapOrError(Obj->getSection(Sec->sh_link));
   StringRef StringTable(
       reinterpret_cast<const char *>(Obj->base() + StrTabSec->sh_offset),
-      StrTabSec->sh_size);
+      (size_t)StrTabSec->sh_size);
 
   const uint8_t *VerdefBuf = unwrapOrError(Obj->getSectionContents(Sec)).data();
   const uint8_t *Begin = VerdefBuf;
@@ -3568,7 +3568,7 @@
   const Elf_Shdr *StrTabSec = unwrapOrError(Obj->getSection(Sec->sh_link));
   StringRef StringTable = {
       reinterpret_cast<const char *>(Obj->base() + StrTabSec->sh_offset),
-      StrTabSec->sh_size};
+      (size_t)StrTabSec->sh_size};
 
   const uint8_t *VerneedBuf = SecData.data();
   for (unsigned I = 0; I < VerneedNum; ++I) {