[lldb] Enable cross CU decl file test only for x64 Linux

[werat]

Summary

Fix tests after https://reviews.llvm.org/D96778

[teemperor]

You can just directly land these bot fixes (or you revert the original aptch). Not sure if I'm the right person to review this as I rarely touch the shell tests, but Jonas or Pavel probably know for sure what's the proper way to restrict the test environment for this one.

[werat]

The original commit was reverted, abandon in favor of https://reviews.llvm.org/D97765

lldb/test/Shell/SymbolFile/DWARF/DW_TAG_variable-DW_AT_decl_file-DW_AT_abstract_origin-crosscu1.s

 # Check that DW_AT_decl_file of DW_AT_variable which is inherited by
 # DW_AT_abstract_origin from a different DW_TAG_compile_unit is using the
 # DW_TAG_compile_unit->DW_AT_stmt_list where the DW_AT_decl_file is located (and
 # not where the DW_AT_abstract_origin is located).
 # DW_TAG_variable in CU 1 is using DW_AT_decl_file 3.
 # CU 1 has files: 
 # file_names[  1]: name: "inlinevarother.h"
 # file_names[  2]: name: "inlinevar1.c"
 # file_names[  3]: name: "inlinevar.h"
 # CU 2 has files: 
 # file_names[  1]: name: "inlinevar2.c"
 # file_names[  2]: name: "inlinevar.h"
 
-# REQUIRES: x86
+# REQUIRES: x86_64-linux
 
 // RUN: %clang -o %t --target=x86_64-pc-linux %s \
 // RUN:   %S/Inputs/DW_TAG_variable-DW_AT_decl_file-DW_AT_abstract_origin-crosscu2.s
 
 # RUN: %lldb %t \
 # RUN:   -o 'b other' -o r -o disas -o 'frame variable --show-declaration' \
 # RUN:   -o exit | FileCheck %s