add tests for pesudo elw

Author: realqhc

llvm/test/MC/RISCV/corev/XCVelw-pseudo.s

@@ -0,0 +1,11 @@
+# RUN: llvm-mc %s -triple=riscv32 --mattr=+xcvelw | FileCheck %s
+
+# CHECK: .Lpcrel_hi0:
+# CHECK: auipc a2, %pcrel_hi(a_symbol)
+# CHECK: cv.elw a2, %pcrel_lo(.Lpcrel_hi0)(a2)
+cv.elw a2, a_symbol
+
+# CHECK: .Lpcrel_hi1:
+# CHECK: auipc a3, %pcrel_hi(a_symbol)
+# CHECK: cv.elw a3, %pcrel_lo(.Lpcrel_hi1)(a3)
+cv.elw a3, a_symbol