Revert "run-lldb-tests: Skip the detailed backtrace/variable checks for i686+pdb"

Since d4514b155337f013022c6e989d3e6b7183a8b80e in llvm-project
(Sep 20th), the pdb reading regression has been fixed.

This reverts commit 13a788dc62.

run-lldb-tests.sh

@@ -79,10 +79,8 @@ for exe in hello-exception-dwarf.exe hello-exception-pdb.exe hello-exception-spl
     if [ "$ARCH" != "armv7" ] || [ "$exe" = "hello-exception-pdb.exe" ]; then
         grep -q "volatile int.*NULL.*0x42" $OUT
     fi
-    if [ "$ARCH" != "armv7" ] && ([ "$ARCH" != "i686" ] || [ "$exe" != "hello-exception-pdb.exe" ]); then
+    if [ "$ARCH" != "armv7" ]; then
         # armv7 pdb gives "val=<unavailable>".
-        # i686 pdb also gives "val=<unavailable>" since LLDB 16
-        # (see https://github.com/llvm/llvm-project/issues/57799 for details).
         grep -q "frame #0: .*hello-exception.*.exe.recurse(val=0) at hello-exception.cpp:" $OUT
         grep -q "hello-exception.*.exe.recurse(val=10) at hello-exception.cpp:" $OUT
     fi