From: Benjamin Barenblat <bbaren@google.com>
Subject: Allow __cxa_demangle on MIPS
Origin: backport, https://github.com/abseil/abseil-cpp/commit/519ef3b3f1927972bce669d775abb9b512dd590d

Both libstdc++ and libc++abi currently ship a __cxa_demangle on MIPS;
there’s no reason to avoid using it.

--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -902,9 +902,8 @@
 #error ABSL_INTERNAL_HAS_CXA_DEMANGLE cannot be directly set
 #elif defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__))
 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 0
-#elif defined(__GNUC__) && defined(__GNUC_MINOR__) &&            \
-    (__GNUC__ >= 4 || (__GNUC__ >= 3 && __GNUC_MINOR__ >= 4)) && \
-    !defined(__mips__)
+#elif defined(__GNUC__) && defined(__GNUC_MINOR__) && \
+    (__GNUC__ >= 4 || (__GNUC__ >= 3 && __GNUC_MINOR__ >= 4))
 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1
 #elif defined(__clang__) && !defined(_MSC_VER)
 #define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1