Changes

[lld][ELF] Don't apply --fix-cortex-a53-843419 to relocatable links.
The code doesn't apply the fix correctly to relocatable links. I could 
try to fix the code that applies the fix, but it's pointless: we don't 
actually know what the offset will be in the final executable. So just 
ignore the flag for relocatable links.
Issue discovered building Android.
Differential Revision: https://reviews.llvm.org/D72968