Bug fix in AArch64 PLT Entry

[stewartd]

Summary

This fixes an incorrect PLT entry.

[shankarke]

The testcases that you have added with this commit, is nothing to do with the change that you have made for PLT.

I would recommend adding a test for the PLT0 change with this commit and separate the tests that you have created into a separate commit.

[stewartd]

Removing the other test cases.

[shankarke]

The got atom should have the name to the PLT0 atom in debug mode.

[stewartd]

Adding the name of the PLT0 atom in debug mode.

[mcrosier]

Committed in r218418.

lib/ReaderWriter/ELF/AArch64/AArch64RelocationPass.cpp

     pa->addReferenceELF_AArch64(R_AARCH64_NONE, 12, getPLT0(), 0);
     // Set the starting address of the got entry to the first instruction in
     // the plt0 entry.
-    ga->addReferenceELF_AArch64(R_AARCH64_ABS32, 0, pa, 0);
+    ga->addReferenceELF_AArch64(R_AARCH64_ABS32, 0, getPLT0(), 0);
 #ifndef NDEBUG
     ga->_name = "__got_";
     ga->_name += a->name();