[NFC][Assignment Tracking Analysis] Add x86 triple to lower-offset-expression.ll

[pavelkopyl]

Summary

This prevents failing the test on targets other than X86
that are set as default when X86 one is also supported.

[pavelkopyl]

-Updated commit message

[Orlando]

Thank you for the patch, this LGTM

[asavonic]

Committed in rG6ff87fed441680f0d673186e602c6017fef68640

llvm/test/DebugInfo/assignment-tracking/X86/lower-offset-expression.ll

 ; RUN: llc %s -stop-after=finalize-isel -o - \
 ; RUN:    -experimental-assignment-tracking  \
 ; RUN: | FileCheck %s
 
 ;; Handwritten test.
 
 ;; Here we have dbg.assign intrinsics with fragments (in the value-expression)
 ;; and address-expressions that involve arithmetic. The generated DBG_VALUE
 ;; intructions needs a DIExpression that:
 ;;     a) Uses the fragment from the value-expression,
 ;;     b) Uses the offset expression of the address-expression,
 ;;     c) Has a DW_OP_deref appended.
 
 ; CHECK: DBG_VALUE %stack.0.a, $noreg, {{.+}}, !DIExpression(DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_LLVM_fragment, 64, 32), debug-location
 
+target triple = "x86_64-unknown-linux-gnu"
+
 define dso_local void @fun() !dbg !7 {
 entry:
   %a = alloca <4 x i32>, !DIAssignID !24
   call void @llvm.dbg.assign(metadata i32 undef, metadata !16, metadata !DIExpression(), metadata !24, metadata ptr %a, metadata !DIExpression()), !dbg !34
   ;; unlink and undef a dbg.assign to avoid using sidetable for var loc.
   call void @llvm.dbg.assign(metadata i32 undef, metadata !16, metadata !DIExpression(), metadata !26, metadata ptr undef, metadata !DIExpression()), !dbg !34
   %idx2 = getelementptr inbounds i32, i32* %a, i32 2
   store i32 100, i32* %idx2, !DIAssignID !25