Revert "[sanitizer] Add compress_stack_depot flag"

This is failing on clang-s390x-linux,
https://lab.llvm.org/buildbot/#/builders/94/builds/6748.
This reverts commit bf18253.

compiler-rt/lib/sanitizer_common/sanitizer_flags.inc

@@ -191,8 +191,6 @@ COMMON_FLAG(const char *, stack_trace_format, "DEFAULT",
             "Format string used to render stack frames. "
             "See sanitizer_stacktrace_printer.h for the format description. "
             "Use DEFAULT to get default format.")
-COMMON_FLAG(int, compress_stack_depot, 0,
-            "Compress stack depot to save memory.")
 COMMON_FLAG(bool, no_huge_pages_for_shadow, true,
             "If true, the shadow is not allowed to use huge pages. ")
 COMMON_FLAG(bool, strict_string_checks, false,

compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cpp

@@ -72,25 +72,12 @@ uptr StackDepotNode::allocated() {
   return stackStore.Allocated() + useCounts.MemoryUsage();
 }
 
-static void CompressStackStore() {
-  u64 start = MonotonicNanoTime();
-  uptr diff = stackStore.Pack(static_cast<StackStore::Compression>(
-      common_flags()->compress_stack_depot));
-  if (!diff)
-    return;
-  u64 finish = MonotonicNanoTime();
-  uptr total = stackStore.Allocated();
-  VPrintf(1, "%s: StackDepot released %zu KiB out of %zu KiB in %llu ms\n",
-          SanitizerToolName, diff >> 10, total >> 10,
-          (finish - start) / 1000000);
-}
-
 void StackDepotNode::store(u32 id, const args_type &args, hash_type hash) {
   stack_hash = hash;
   uptr pack = 0;
   store_id = stackStore.Store(args, &pack);
-  if (pack && common_flags()->compress_stack_depot)
-    CompressStackStore();
+  if (pack)
+    stackStore.Pack(StackStore::Compression::None);
 }
 
 StackDepotNode::args_type StackDepotNode::load(u32 id) const {