[builtins] Introduce proper Float64Log2 and Float64Log10 operators.

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index c3fcc271e199824078d18c5d20598cb609056340..e4feeaea42da52addcf6052680c764499f2fa2ce 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -159,6 +159,8 @@ MachineRepresentation AtomicStoreRepresentationOf(Operator const* op) {
   V(Float64Atan2, Operator::kNoProperties, 2, 0, 1)                           \
   V(Float64Log, Operator::kNoProperties, 1, 0, 1)                             \
   V(Float64Log1p, Operator::kNoProperties, 1, 0, 1)                           \
+  V(Float64Log2, Operator::kNoProperties, 1, 0, 1)                            \
+  V(Float64Log10, Operator::kNoProperties, 1, 0, 1)                           \
   V(Float64Add, Operator::kCommutative, 2, 0, 1)                              \
   V(Float64Sub, Operator::kNoProperties, 2, 0, 1)                             \
   V(Float64SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                  \