base: ELF segment types are not bitfields.

The ELF segment type had been checked by bitwise &-ing it with the
PT_LOAD constant to check if it was loadable. This is incorrect. The
value is a flat integer, with different values selecting different
types of segments.

Change-Id: I644dd985bda4ad2d992557c90ffe8048c0ae6aac
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21460
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>

src/base/loader/elf_object.cc

@@ -342,7 +342,7 @@ ElfObject::ElfObject(const std::string &_filename, size_t _len,
         }
 
         // for now we don't care about non-loadable segments
-        if (!(phdr.p_type & PT_LOAD))
+        if (phdr.p_type != PT_LOAD)
             continue;
 
         ldMin = std::min(ldMin, phdr.p_vaddr);