[RISCV] Bugfix createRISCVELFObjectWriter

r315275 set the IsLittleEndian parameter incorrectly. This patch corrects 
this, and adds a test to ensure such mistakes will be caught in the future.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316091 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed