Fix merge in group-instructions.ll

Author: jsji

llvm-spirv/test/extensions/KHR/SPV_KHR_uniform_group_instructions/group-instructions.ll

@@ -10,10 +10,6 @@
 ; RUN: llvm-dis %t.rev.bc -o %t.rev.ll
 ; RUN: FileCheck < %t.rev.ll %s --check-prefix=CHECK-LLVM
 
-; RUN: llvm-spirv --spirv-target-env=SPV-IR -r %t.spv -o %t.rev.bc
-; RUN: llvm-dis %t.rev.bc
-; RUN: FileCheck < %t.rev.ll %s --check-prefix=CHECK-LLVM-SPIRV
-
 ; CHECK-WO-EXT: RequiresExtension: Feature requires the following SPIR-V extension:
 ; CHECK-WO-EXT: SPV_KHR_uniform_group_instructions