Revert "Switch to -fdebug-compilation-dir"

This reverts commit 0cb8757.

This flag isn't supported by Xcode 11.2, which is the newest available
version for macOS 10.14

#12354 (comment)

Fixes #12905

Closes #12882.

PiperOrigin-RevId: 355126529

Author: keith

tools/osx/crosstool/cc_toolchain_config.bzl

@@ -5400,7 +5400,7 @@ def _impl(ctx):
                     ACTION_NAMES.objc_compile,
                     ACTION_NAMES.objcpp_compile,
                 ],
-                flag_groups = [flag_group(flags = ["-fdebug-compilation-dir", "."])],
+                flag_groups = [flag_group(flags = ["DEBUG_PREFIX_MAP_PWD=."])],
             ),
         ],
     )

tools/osx/crosstool/wrapped_clang.cc

@@ -318,6 +318,9 @@ void ProcessArgument(const std::string arg, const std::string developer_dir,
   }
 
   std::string dest_dir, bitcode_symbol_map;
+  if (SetArgIfFlagPresent(arg, "DEBUG_PREFIX_MAP_PWD", &dest_dir)) {
+    new_arg = "-fdebug-prefix-map=" + cwd + "=" + dest_dir;
+  }
   if (arg.compare("OSO_PREFIX_MAP_PWD") == 0) {
     new_arg = "-Wl,-oso_prefix," + cwd + "/";
   }