[DebugInfo] Fix for split dwarf test on Windows (NFC)

On Windows, %llc_dwarf automatically adds -mtriple causing this test to
error. Changed %llc_dwarf to llc.

Differential Revision: https://reviews.llvm.org/D45869

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330414 91177308-0d34-0410-b5e6-96231b3b80d8

Author: nga888

test/DebugInfo/X86/debug-names-split-dwarf.ll

@@ -1,7 +1,7 @@
 ; REQUIRES: object-emission
 
 ; Verify that DWARF v5 accelerator tables work with split-dwarf.
-; RUN: %llc_dwarf -mtriple x86_64-pc-linux -split-dwarf-file=foo.dwo \
+; RUN: llc -mtriple x86_64-pc-linux -split-dwarf-file=foo.dwo \
 ; RUN:   -accel-tables=Dwarf -filetype=obj -o %t < %s
 ; RUN: llvm-dwarfdump -debug-names - <%t | FileCheck %s