[builtins] Migrate a bunch of Math builtins to C++.

src/runtime/runtime-maths.cc

Index: src/runtime/runtime-maths.cc
diff --git a/src/runtime/runtime-maths.cc b/src/runtime/runtime-maths.cc
index 9c4fde1cef930bc8f530524e68cfee58b95b8a6d..f3049f9fabae348fff4a7d9194a439b76e1fde76 100644
--- a/src/runtime/runtime-maths.cc
+++ b/src/runtime/runtime-maths.cc
@@ -23,9 +23,6 @@ namespace internal {
     return *isolate->factory()->NewHeapNumber(std::name(x));   \
   }
 
-RUNTIME_UNARY_MATH(Acos, acos)
-RUNTIME_UNARY_MATH(Asin, asin)
-RUNTIME_UNARY_MATH(Atan, atan)
 RUNTIME_UNARY_MATH(LogRT, log)
 #undef RUNTIME_UNARY_MATH
 
@@ -228,16 +225,6 @@ RUNTIME_FUNCTION(Runtime_MathSqrt) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_MathFround) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-
-  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
-  float xf = DoubleToFloat32(x);
-  return *isolate->factory()->NewNumber(xf);
-}
-
-
 RUNTIME_FUNCTION(Runtime_GenerateRandomNumbers) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);