Convert diamond shaped control flow into a single conditional instruction.

runtime/vm/assembler_ia32.cc

Index: runtime/vm/assembler_ia32.cc
diff --git a/runtime/vm/assembler_ia32.cc b/runtime/vm/assembler_ia32.cc
index 3359f46649c2eff35fe81aabd2993e9b8d563311..0cc72f768d1a04405ae36b6e6881a6281e84dc7a 100644
--- a/runtime/vm/assembler_ia32.cc
+++ b/runtime/vm/assembler_ia32.cc
@@ -165,6 +165,14 @@ void Assembler::popal() {
 }
 
 
+void Assembler::setcc(Condition condition, ByteRegister dst) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0x90 + condition);
+  EmitUint8(0xC0 + dst);
+}
+
+
 void Assembler::movl(Register dst, const Immediate& imm) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xB8 + dst);