[docs] Add link to 32-bit ARM ELF supplement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194011 91177308-0d34-0410-b5e6-96231b3b80d8

docs/CompilerWriterInfo.rst

@@ -124,6 +124,7 @@ Linux
 
 * `PowerPC 64-bit ELF ABI Supplement <http://www.linuxbase.org/spec/ELF/ppc64/>`_
 * `Procedure Call Standard for the AArch64 Architecture <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf>`_
+* `ELF for the ARM Architecture <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf>`_
 * `ELF for the ARM 64-bit Architecture (AArch64) <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056a/IHI0056A_aaelf64.pdf>`_
 * `System z ELF ABI Supplement <http://legacy.redhat.com/pub/redhat/linux/7.1/es/os/s390x/doc/lzsabi0.pdf>`_