Remove remaining MIPS support.

With the exception of dwarf support in libelffile.

Test: aosp_taimen-userdebug boots.
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 147346243
Change-Id: Ib25acbc98aa7f63ce49a7ed2f81a4a64d48eac39
diff --git a/imgdiag/imgdiag_test.cc b/imgdiag/imgdiag_test.cc
index 6c83f9a..9dd7953 100644
--- a/imgdiag/imgdiag_test.cc
+++ b/imgdiag/imgdiag_test.cc
@@ -108,12 +108,11 @@
   std::string boot_image_location_;
 };
 
-#if defined (ART_TARGET) && !defined(__mips__)
+#if defined (ART_TARGET)
 TEST_F(ImgDiagTest, ImageDiffPidSelf) {
 #else
 // Can't run this test on the host, it will fail when trying to open /proc/kpagestats
 // because it's root read-only.
-// Also test fails on mips. b/24596015.
 TEST_F(ImgDiagTest, DISABLED_ImageDiffPidSelf) {
 #endif
   // Invoke 'img_diag' against the current process.