[arm] Add support for SMMLA, SMMLS and SMMUL.

src/base/bits.h

Index: src/base/bits.h
diff --git a/src/base/bits.h b/src/base/bits.h
index d681ba8ba317a7d6bf3c59a52b16f3c96be93050..e094882431c46fe4f11ad4b143af2149daa9cf9a 100644
--- a/src/base/bits.h
+++ b/src/base/bits.h
@@ -187,6 +187,24 @@ inline bool SignedSubOverflow32(int32_t lhs, int32_t rhs, int32_t* val) {
 #endif
 }
 
+
+// SignedMulHigh32(lhs, rhs) multiplies two signed 32-bit values |lhs| and
+// |rhs|, extracts the most significant 32 bits of the result, and returns
+// those.
+int32_t SignedMulHigh32(int32_t lhs, int32_t rhs);
+
+
+// SignedMulHighAndAdd32(lhs, rhs, acc) multiplies two signed 32-bit values
+// |lhs| and |rhs|, extracts the most significant 32 bits of the result, and
+// adds the accumulate value |acc|.
+int32_t SignedMulHighAndAdd32(int32_t lhs, int32_t rhs, int32_t acc);
+
+
+// SignedMulHighAndAdd32(lhs, rhs, acc) multiplies two signed 32-bit values
+// |lhs| and |rhs|, extracts the most significant 32 bits of the result, and
+// subtracts it from the accumulate value |acc|.
+int32_t SignedMulHighAndSub32(int32_t lhs, int32_t rhs, int32_t acc);
+
 }  // namespace bits
 }  // namespace base
 }  // namespace v8