Alex Bradbury 66d9a752b9 [RISCV] Implement codegen for cmpxchg on RV32IA ...

Utilise a similar ('late') lowering strategy to D47882. The changes to 
AtomicExpandPass allow this strategy to be utilised by other targets which 
implement shouldExpandAtomicCmpXchgInIR.

All cmpxchg are lowered as 'strong' currently and failure ordering is ignored. 
This is conservative but correct.

Differential Revision: https://reviews.llvm.org/D48131

llvm-svn: 347914

2018-11-29 20:43:42 +00:00

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