[ELF] - Improve eh-frame-value-format7.s test case.
[ELF] - Improve eh-frame-value-format7.s test case.

This adds .eh_frame_hdr content checking to test
that DW_EH_PE_udata2 address was decoded correctly.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@337374 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld