Emulate MLS on pre-ARMv6T2. Cleaned up thumbee vs. thumb2 confusion.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index a8d4b7ccd458d2e26ec54ee5c40ff3f1a51d0d20..c34a7f75b688f9e8a9ed5c2cf0aa742680d1253f 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -254,6 +254,19 @@ void MacroAssembler::Move(DwVfpRegister dst, DwVfpRegister src) {
 }
 
 
+void MacroAssembler::Mls(Register dst, Register src1, Register src2,
+                         Register srcA, Condition cond) {
+  if (CpuFeatures::IsSupported(MLS)) {
+    CpuFeatureScope scope(this, MLS);
+    mls(dst, src1, src2, srcA, cond);
+  } else {
+    ASSERT(!dst.is(srcA));
+    mul(ip, src1, src2, LeaveCC, cond);
+    sub(dst, srcA, ip, LeaveCC, cond);
+  }
+}
+
+
 void MacroAssembler::And(Register dst, Register src1, const Operand& src2,
                          Condition cond) {
   if (!src2.is_reg() &&