MIPS: Added Android-specific version of cacheflush call.

src/mips/cpu-mips.cc

Index: src/mips/cpu-mips.cc
diff --git a/src/mips/cpu-mips.cc b/src/mips/cpu-mips.cc
index a1e062c803d67aa24a1999870009a42592d0f97a..0d48470020379f3ef7e4911bd18f9adb4a52abd6 100644
--- a/src/mips/cpu-mips.cc
+++ b/src/mips/cpu-mips.cc
@@ -64,15 +64,19 @@ void CPU::FlushICache(void* start, size_t size) {
   }
 
 #if !defined (USE_SIMULATOR)
+#if defined(ANDROID)
+  // Bionic cacheflush can typically run in userland, avoiding kernel call.
+  char *end = reinterpret_cast<char *>(start) + size;
+  cacheflush(
+    reinterpret_cast<intptr_t>(start), reinterpret_cast<intptr_t>(end), 0);
+#else  // ANDROID
   int res;
-
-  // See http://www.linux-mips.org/wiki/Cacheflush_Syscall.
+  // See http://www.linux-mips.org/wiki/Cacheflush_Syscall .
   res = syscall(__NR_cacheflush, start, size, ICACHE);
-
   if (res) {
     V8_Fatal(__FILE__, __LINE__, "Failed to flush the instruction cache");
   }
-
+#endif  // ANDROID
 #else  // USE_SIMULATOR.
   // Not generating mips instructions for C-code. This means that we are
   // building a mips emulator based target.  We should notify the simulator