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[RISCV] Implement pseudo instructions for load/store from a symbol address.

Authored by kito-cheng on Feb 19 2019, 7:31 PM.

Description

[RISCV] Implement pseudo instructions for load/store from a symbol address.

Summary:
Those pseudo-instructions are making load/store instructions able to
load/store from/to a symbol, and its always using PC-relative addressing
to generating a symbol address.

Reviewers: asb, apazos, rogfer01, jrtc27

Differential Revision: https://reviews.llvm.org/D50496

llvm-svn: 354430