[llvm-objdump/llvm-readobj/obj2yaml/yaml2obj] Support DT_PPC_GOT and DT_PPC_OPT

[MaskRay]

Summary

In glibc, DT_PPC_GOT indicates that PowerPC32 Secure PLT ABI is used.
I plan to use it in D62464.

DT_PPC_OPT currently indicates if a TLSDESC inspired TLS optimization is
enabled.

[grimar]

Seems you need to rebase after D62596.

[jhenderson]

test/tools/llvm-readobj/Inputs/elf-dynamic-tags-machine-specific.yaml

185–187 ↗

(On Diff #202904)

Should you add these two tags to the 64-bit PPC rather than create another document? It seems odd having the two different variations.

[MaskRay]

Update all 4 tools at the same time.

[MaskRay]

test/tools/llvm-readobj/Inputs/elf-dynamic-tags-machine-specific.yaml

185–187 ↗

(On Diff #202904)

I have to add a new document. ppc32 and ppc64 have different e_machine values. The two tags are not available on ppc64. Actually, there is a conflict:DT_PPC64_GLINK == DT_PPC_GOT.

[MaskRay]

Rebase after D62596

[jhenderson]

test/tools/llvm-objdump/elf-dynamic-section-machine-specific.test

69 ↗

(On Diff #202916)

If you're adding the extra '#' here, please also add it to the other cases in this file.

78 ↗

(On Diff #202916)

Delete this line (or at least the '#')

test/tools/llvm-readobj/elf-dynamic-tags-machine-specific.test

135 ↗

(On Diff #202916)

PPC32 -> PPC?

[MaskRay]

Address review comments and fix a rebase issue

[grimar]

LGTM

[jhenderson]

LGTM.