[lldb] Enable (un-xfail) some dwarf tests for arm

These are passing now that the relocation assertion has been removed in
D132954.

Relocations still remain unimplemented though, so it's possible this may
start to fail due to unrelated changes. If that happens very often, we
may just need to disable (skip) the test instead.

lldb/test/Shell/SymbolFile/DWARF/anon_class_w_and_wo_export_symbols.ll

@@ -1,4 +1,3 @@
-; XFAIL: target-arm && linux-gnu
 ; UNSUPPORTED: system-windows
 ;
 ; This test verifies that we do the right thing with DIFlagExportSymbols which is the new

lldb/test/Shell/SymbolFile/DWARF/clang-ast-from-dwarf-unamed-and-anon-structs.cpp

@@ -1,4 +1,3 @@
-// XFAIL: target-arm && linux-gnu
 // UNSUPPORTED: system-windows
 //
 // Test to verify we are correctly generating anonymous flags when parsing

lldb/test/Shell/SymbolFile/DWARF/split-optimized.c

@@ -6,9 +6,6 @@
 // This test uses lldb's embedded python interpreter
 // REQUIRES: python
 
-// ObjectFileELF::ApplyRelocations does not implement arm32.
-// XFAIL: target-arm && linux-gnu
-
 // RUN: %clang_host %s -fno-standalone-debug -glldb \
 // RUN:   -gdwarf-5 -gpubnames -gsplit-dwarf -O3 -c -o %t1.o