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[AArch64] Attempt to parse more operands as expressions

Authored by dmgreen on Sep 18 2018, 2:44 AM.

Description

[AArch64] Attempt to parse more operands as expressions

This tries to make use of evaluateAsRelocatable in AArch64AsmParser::classifySymbolRef
to parse more complex expressions as relocatable operands. It is hopefully better than
the existing code which only handles Symbol +- Constant.

This allows us to parse more complex adr/adrp, mov, ldr/str and add operands. It also
loosens the requirements on parsing addends in ld/st and mov's and adds a number of
tests.

Differential Revision: https://reviews.llvm.org/D51792

llvm-svn: 342455