[ELF][test] Consolidate .eh_frame FDE encoding tests
Merge eh-frame-value-format{1..9}.s into eh-frame-fde-encoding.s
(encoding is the DWARF term) using split-file. Add .eh_frame and
.eh_frame_hdr content verification for absptr, udata2, sdata4, udata4.
Move error test (9) to eh-frame-invalid-fde-encoding.s.
