Shorter TryAllocate instruction sequence on ARM/ARM64/MIPS.

runtime/vm/assembler.cc

Index: runtime/vm/assembler.cc
diff --git a/runtime/vm/assembler.cc b/runtime/vm/assembler.cc
index 65e56276cd11ae4fb71cdb65e75c3ce3a2908ec7..f259071c1d824dc7e0523ec3e769ac6dfac2ea78 100644
--- a/runtime/vm/assembler.cc
+++ b/runtime/vm/assembler.cc
@@ -210,7 +210,7 @@ void Assembler::Unreachable(const char* message) {
 
 
 void Assembler::Comment(const char* format, ...) {
-  if (FLAG_code_comments || FLAG_disassemble || FLAG_disassemble_optimized) {
+  if (EmittingComments()) {
     char buffer[1024];
 
     va_list args;
@@ -225,6 +225,11 @@ void Assembler::Comment(const char* format, ...) {
 }
 
 
+bool Assembler::EmittingComments() {
+  return FLAG_code_comments || FLAG_disassemble || FLAG_disassemble_optimized;
+}
+
+
 const Code::Comments& Assembler::GetCodeComments() const {
   Code::Comments& comments = Code::Comments::New(comments_.length());