Move stripping of debug symbols on linux behind a flag

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 069f10b98123f4560bee01bcdaaea8cf674e22e3..3b31bd75744c0413754ede71df2f8d155b41706b 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -92,6 +92,9 @@ declare_args() {
   # Optimize for coverage guided fuzzing (balance between speed and number of
   # branches)
   optimize_for_fuzzing = false
+
+  # Optimize symbol files for maximizing goma cache hit rate.
+  strip_absolute_paths_from_debug_symbols = false
 }
 
 if (is_clang && !is_nacl) {
@@ -425,7 +428,7 @@ config("compiler") {
   # clang-cl (used if is_win) doesn't expose this flag.
   # Currently disabled for nacl since its toolchain lacks this flag (too old).
   # TODO(zforman): Once nacl's toolchain is updated, remove check.
-  if (is_clang && is_linux) {
+  if (is_clang && is_linux && strip_absolute_paths_from_debug_symbols) {
     absolute_path = rebase_path("//.")
     cflags += [ "-fdebug-prefix-map=$absolute_path=." ]
   }