[yaml2obj][obj2yaml] Remove section type range markers from allowed mappings and...

[yaml2obj][obj2yaml] Remove section type range markers from allowed mappings and support hex values

yaml2obj/obj2yaml previously supported SHT_LOOS, SHT_HIOS, and
SHT_LOPROC for section types. These are simply values that delineate a
range and don't really make sense as valid values. For example if a
section has type value 0x70000000, obj2yaml shouldn't print this value
as SHT_LOPROC. Additionally, this was missing the three other range
markers (SHT_HIPROC, SHT_LOUSER and SHT_HIUSER).

This change removes these three range markers. It also adds support for
specifying the type as an integer, to allow section types that LLVM
doesn't know about.

Reviewed by: grimar

Differential Revision: https://reviews.llvm.org/D58383

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354344 91177308-0d34-0410-b5e6-96231b3b80d8