remove duplicate option

Author: sunshaoce

llvm/test/CodeGen/RISCV/GlobalISel/store-fp-zero-to-x0.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -global-isel -mtriple=riscv32 -global-isel -mattr=+f,+zfh < %s \
+; RUN: llc -global-isel -mtriple=riscv32 -mattr=+f,+zfh < %s \
 ; RUN:   | FileCheck %s --check-prefix=RV32
-; RUN: llc -global-isel -mtriple=riscv64 -global-isel -mattr=+d,+zfh < %s \
+; RUN: llc -global-isel -mtriple=riscv64 -mattr=+d,+zfh < %s \
 ; RUN:   | FileCheck %s --check-prefix=RV64
 
 define void @zero_f16(ptr %i) {