[LLVM-520] LLD Fix movt/movw relocation overflow
Now committed upstream.

[LLVM-521] Taking the address of an ifunc in AArch64
Prompted by a bug report and comment about pointer equivalence, spent
some time looking into gold, lld and bfd behaviour to ensure that LLD
is at least correct.

Other
Some investigation into LLD non-support of common-page-size and
whether this is significant for code-size. Used in response to query
about whether LLD should change default value of max-page-size.

Thoughts about whether a linker must generate cantunwind .ARM.exidx
sections for code sections missing a .ARM.exidx section. If C++ code
with exceptions is interleaved with some assembly code without
.ARM.exidx sections then the assembly code can match the address range
of the C++ code that precedes it.
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