[RISCV] Implement isLegalAddressingMode for RISC-V

This has no impact on codegen for the current RISC-V unit tests or my small 
benchmark set and very minor changes in a few programs in the GCC torture 
suite. Based on this, I haven't been able to produce a representative test 
program that demonstrates a benefit from isLegalAddressingMode. I'm committing 
the patch anyway, on the basis that presenting accurate information to the 
target-independent code is preferable to relying on incorrect generic 
assumptions.

llvm-svn: 330932