[lld] Fix test failures when running as root user (llvm#81339)

This makes it easier to run the tests in a containerized environment.

(cherry picked from commit e165bea)

lld/test/COFF/lto-cache-errors.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 ;; Not supported on windows since we use permissions to deny the creation
 ; UNSUPPORTED: system-windows
 

lld/test/COFF/thinlto-emit-imports.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 
 ; Generate summary sections and test lld handling.
 ; RUN: opt -module-summary %s -o %t1.obj

lld/test/ELF/lto/resolution-err.ll

@@ -1,5 +1,5 @@
 ; UNSUPPORTED: system-windows
-; REQUIRES: shell
+; REQUIRES: shell, non-root-user
 ; RUN: llvm-as %s -o %t.bc
 ; RUN: touch %t.resolution.txt
 ; RUN: chmod u-w %t.resolution.txt

lld/test/ELF/lto/thinlto-cant-write-index.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 
 ; Basic ThinLTO tests.
 ; RUN: opt -module-summary %s -o %t1.o

lld/test/ELF/lto/thinlto-emit-imports.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 ;; Test a few properties not tested by thinlto-index-only.ll
 
 ; RUN: opt -module-summary %s -o %t1.o

lld/test/MachO/invalid/invalid-lto-object-path.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 
 ;; Creating read-only directories with `chmod 400` isn't supported on Windows
 ; UNSUPPORTED: system-windows

lld/test/MachO/thinlto-emit-imports.ll

@@ -1,4 +1,4 @@
-; REQUIRES: x86
+; REQUIRES: x86, non-root-user
 ; RUN: rm -rf %t; split-file %s %t
 
 ; Generate summary sections and test lld handling.