bazel: compress DWARF debug sections in asan/profile configs

The default bazel build is -c opt with no -g, so it carries no debug
info. The asan and profile configs add -g (and keep symbols via
--strip=never), so their binaries carry DWARF that benefits from
compression, mirroring the CMake -gz change.

Add -gz=zlib (compile + link) to the asan and profile configs. It is
transparent to gdb/perf/addr2line.

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

Author: maliberty

.bazelrc

@@ -111,6 +111,9 @@ build:asan --copt=-DADDRESS_SANITIZER
 build:asan --copt=-O1
 build:asan --copt=-g
 build:asan --copt=-fno-omit-frame-pointer
+# Compress the DWARF debug sections (transparent to gdb/perf/addr2line).
+build:asan --copt=-gz=zlib
+build:asan --linkopt=-gz=zlib
 build:asan --linkopt=-fsanitize=address
 # TCMalloc is incompatible with ASan: __asan_init's interceptor setup calls
 # dlsym -> malloc before TCMalloc is initialized, segfaulting at startup.
@@ -123,6 +126,9 @@ build:profile --strip=never
 build:profile --copt -g --host_copt -g
 build:profile --copt -gmlt --host_copt -gmlt
 build:profile --copt -fno-omit-frame-pointer --host_copt -fno-omit-frame-pointer
+# Compress the DWARF debug sections (transparent to gdb/perf/addr2line).
+build:profile --copt=-gz=zlib --host_copt=-gz=zlib
+build:profile --linkopt=-gz=zlib
 
 # Improve hermeticity by disallowing user envars and network access
 build --incompatible_strict_action_env