Remove MIPS support

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index 5f88c665aeae36cb22e6b178b77d21b05d63fca2..84d58a6ade43a0d186bdf7a22053d8497616941f 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -718,11 +718,10 @@ RawCode* CompileParsedFunctionHelper::Compile(CompilationPipeline* pipeline) {
   HANDLESCOPE(thread());
 
   // We may reattempt compilation if the function needs to be assembled using
-  // far branches on ARM and MIPS. In the else branch of the setjmp call,
-  // done is set to false, and use_far_branches is set to true if there is a
-  // longjmp from the ARM or MIPS assemblers. In all other paths through this
-  // while loop, done is set to true. use_far_branches is always false on ia32
-  // and x64.
+  // far branches on ARM. In the else branch of the setjmp call, done is set to
+  // false, and use_far_branches is set to true if there is a longjmp from the
+  // ARM assembler. In all other paths through this while loop, done is set to
+  // true. use_far_branches is always false on ia32 and x64.
   volatile bool done = false;
   // volatile because the variable may be clobbered by a longjmp.
   volatile bool use_far_branches = false;