[RISCV] AsmParser support for the li pseudo instruction

The implementation follows the MIPS backend and expands the pseudo instruction 
directly during asm parsing. As the result, only real MC instructions are 
emitted to the MCStreamer. The actual expansion to real instructions is 
similar to the expansion performed by the GNU Assembler.

This patch supersedes D41949.

Differential Revision: https://reviews.llvm.org/D46118
Patch by Mario Werner.

llvm-svn: 334203