[BOLT][test] Don't unnecessarily pass an explicit target

The X86 directory lit config sets it already, there's no reason for this test to do it by itself.

Author: tambry

bolt/test/X86/dwarf5-df-inlined-subroutine-gc-sections-range.test

@@ -6,7 +6,7 @@
 ; RUN: -split-dwarf-file=main.dwo -o main.o
 ; RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-df-inlined-subroutine-gc-sections-range-helper.s \
 ; RUN: -split-dwarf-file=helper.dwo -o helper.o
-; RUN: %clang --target=x86_64-pc-linux -fuse-ld=lld -Wl,-gc-sections -Wl,-q -gdwarf-5 -gsplit-dwarf=split main.o helper.o -o main.exe
+; RUN: %clang -fuse-ld=lld -Wl,-gc-sections -Wl,-q -gdwarf-5 -gsplit-dwarf=split main.o helper.o -o main.exe
 ; RUN: llvm-bolt main.exe -o main.exe.bolt --update-debug-sections
 ; RUN: llvm-dwarfdump --debug-addr main.exe > log.txt
 ; RUN: llvm-dwarfdump --debug-rnglists --verbose --show-form main.dwo >> log.txt