Thumb2 Backend: Enable Crankshaft to compile all Optimized Functions in Thumb2 mode

src/lithium.cc

Index: src/lithium.cc
diff --git a/src/lithium.cc b/src/lithium.cc
index 790a2182b176ac5d86e701e01395297d90c6e5ca..5b3a30332c6d88d609206e0ba3c78927399964c4 100644
--- a/src/lithium.cc
+++ b/src/lithium.cc
@@ -450,13 +450,23 @@ Handle<Code> LChunk::Codegen() {
   LOG_CODE_EVENT(info()->isolate(),
                  CodeStartLinePosInfoRecordEvent(
                      assembler.positions_recorder()));
+
+  Code::Flags flags = info()->flags();
+  Code::Kind kind = Code::ExtractKindFromFlags(flags);
+
+  if (FLAG_enable_thumb2_crankshaft && kind == Code::OPTIMIZED_FUNCTION) {
+    assembler.set_thumb_mode();
+  }
   LCodeGen generator(this, &assembler, info());
 
   MarkEmptyBlocks();
 
   if (generator.GenerateCode()) {
     CodeGenerator::MakeCodePrologue(info(), "optimized");
-    Code::Flags flags = info()->flags();
+    if (FLAG_enable_thumb2_crankshaft && kind == Code::OPTIMIZED_FUNCTION) {
+      flags = Code::ComputeFlags(kind, UNINITIALIZED, Code::kNoExtraICState,
+                                 Code::NORMAL, -1, OWN_MAP, true);
+    }
     Handle<Code> code =
         CodeGenerator::MakeCodeEpilogue(&assembler, flags, info());
     generator.FinishCode(code);