Remove MIPS support

runtime/vm/snapshot.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 974 matching lines @@
   assembly_stream_.Print(".fnstart\n");
   assembly_stream_.Print(".save {r7, lr}\n");
   assembly_stream_.Print(".setfp r7, sp, #0\n");
 #else
   COMPILE_ASSERT(FP == R11);
   assembly_stream_.Print(".fnstart\n");
   assembly_stream_.Print(".save {r11, lr}\n");
   assembly_stream_.Print(".setfp r11, sp, #0\n");
 #endif
 
-#elif defined(TARGET_ARCH_MIPS)
-  COMPILE_ASSERT(FP == R30);
-  COMPILE_ASSERT(RA == R31);
-  assembly_stream_.Print(".cfi_def_cfa r30, 0\n");  // CFA is fp+0
-  assembly_stream_.Print(".cfi_offset r30, 0\n");   // saved fp is *(CFA+0)
-  assembly_stream_.Print(".cfi_offset r31, 4\n");   // saved pc is *(CFA+4)
-  // saved sp is CFA+16
-  // Should be ".cfi_value_offset sp, 8", but requires gcc newer than late
-  // 2016 and not supported by Android's libunwind.
-  // DW_CFA_expression          0x10
-  // uleb128 register (sp)        29
-  // uleb128 size of operation     2
-  // DW_OP_plus_uconst          0x23
-  // uleb128 addend                8
-  assembly_stream_.Print(".cfi_escape 0x10, 29, 2, 0x23, 8\n");
 #endif
 }
 
 
 void AssemblyImageWriter::FrameUnwindEpilogue() {
 #if defined(TARGET_ARCH_ARM)
   assembly_stream_.Print(".fnend\n");
 #endif
   assembly_stream_.Print(".cfi_endproc\n");
 }
@@ skipping 1046 matching lines @@
       *buffer_len_ = BytesWritten();
     }
   } else {
     FreeBuffer();
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart