fix test case

Author: Shoreshen

llvm/test/CodeGen/AMDGPU/llvm.rint.f64.ll

@@ -1,6 +1,7 @@
 ; RUN: llc -mtriple=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=CI -check-prefix=FUNC %s
 ; RUN: llc -mtriple=amdgcn -mcpu=bonaire -verify-machineinstrs < %s | FileCheck -check-prefix=CI -check-prefix=FUNC %s
 ; RUN: llc -mtriple=amdgcn -mcpu=tahiti -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+
 ; FUNC-LABEL: {{^}}rint_f64:
 ; CI: v_rndne_f64_e32