Modify vm code base so that it can be built for --arch=simmips.

runtime/vm/vm_sources.gypi

Index: runtime/vm/vm_sources.gypi
===================================================================
--- runtime/vm/vm_sources.gypi	(revision 17318)
+++ runtime/vm/vm_sources.gypi	(working copy)
@@ -22,8 +22,12 @@
     'assembler_macros_arm.h',
     'assembler_macros_ia32.cc',
     'assembler_macros_ia32.h',
+    'assembler_macros_mips.cc',
+    'assembler_macros_mips.h',
     'assembler_macros_x64.cc',
     'assembler_macros_x64.h',
+    'assembler_mips.cc',
+    'assembler_mips.h',
     'assembler_x64.cc',
     'assembler_x64.h',
     'assembler_x64_test.cc',
@@ -74,6 +78,7 @@
     'code_patcher_arm.cc',
     'code_patcher_ia32.cc',
     'code_patcher_ia32_test.cc',
+    'code_patcher_mips.cc',
     'code_patcher_x64.cc',
     'code_patcher_x64_test.cc',
     'compiler.h',
@@ -81,13 +86,15 @@
     'compiler_stats.h',
     'compiler_stats.cc',
     'compiler_test.cc',
+    'constants_arm.h',
     'constants_ia32.h',
+    'constants_mips.h',
     'constants_x64.h',
-    'constants_arm.h',
     'cpu.h',
+    'cpu_arm.cc',
     'cpu_ia32.cc',
+    'cpu_mips.cc',
     'cpu_x64.cc',
-    'cpu_arm.cc',
     'cpu_test.cc',
     'custom_isolate_test.cc',
     'dart.cc',
@@ -102,17 +109,19 @@
     'dart_entry_test.cc',
     'debugger.cc',
     'debugger.h',
+    'debugger_arm.cc',
     'debugger_ia32.cc',
+    'debugger_mips.cc',
     'debugger_x64.cc',
-    'debugger_arm.cc',
     'debugger_api_impl_test.cc',
     'deopt_instructions.cc',
     'deopt_instructions.h',
     'disassembler.cc',
     'disassembler.h',
+    'disassembler_arm.cc',
     'disassembler_ia32.cc',
+    'disassembler_mips.cc',
     'disassembler_x64.cc',
-    'disassembler_arm.cc',
     'disassembler_test.cc',
     'debuginfo.h',
     'debuginfo_android.cc',
@@ -136,6 +145,7 @@
     'flow_graph_compiler.h',
     'flow_graph_compiler_arm.cc',
     'flow_graph_compiler_ia32.cc',
+    'flow_graph_compiler_mips.cc',
     'flow_graph_compiler_x64.cc',
     'flow_graph_inliner.cc',
     'flow_graph_inliner.h',
@@ -179,6 +189,8 @@
     'instructions_ia32.cc',
     'instructions_ia32.h',
     'instructions_ia32_test.cc',
+    'instructions_mips.cc',
+    'instructions_mips.h',
     'instructions_x64.cc',
     'instructions_x64.h',
     'instructions_x64_test.cc',
@@ -186,12 +198,14 @@
     'intermediate_language.h',
     'intermediate_language_arm.cc',
     'intermediate_language_ia32.cc',
+    'intermediate_language_mips.cc',
     'intermediate_language_x64.cc',
     'intermediate_language_test.cc',
     'intrinsifier.h',
     'intrinsifier.cc',
     'intrinsifier_arm.cc',
     'intrinsifier_ia32.cc',
+    'intrinsifier_mips.cc',
     'intrinsifier_x64.cc',
     'isolate.cc',
     'isolate.h',
@@ -226,6 +240,7 @@
     'object_test.cc',
     'object_arm_test.cc',
     'object_ia32_test.cc',
+    'object_mips_test.cc',
     'object_x64_test.cc',
     'object_store.cc',
     'object_store.h',
@@ -254,6 +269,7 @@
     'runtime_entry.h',
     'runtime_entry_arm.cc',
     'runtime_entry_ia32.cc',
+    'runtime_entry_mips.cc',
     'runtime_entry_x64.cc',
     'runtime_entry_test.cc',
     'scanner.cc',
@@ -271,6 +287,7 @@
     'stack_frame.cc',
     'stack_frame_arm.cc',
     'stack_frame_ia32.cc',
+    'stack_frame_mips.cc',
     'stack_frame_x64.cc',
     'stack_frame.h',
     'stack_frame_test.cc',
@@ -281,6 +298,7 @@
     'stub_code_arm.cc',
     'stub_code_ia32.cc',
     'stub_code_ia32_test.cc',
+    'stub_code_mips.cc',
     'stub_code_x64.cc',
     'stub_code_x64_test.cc',
     'symbols.cc',