[regexp] Remove remainder of native RegExpExecStub

src/arm64/interface-descriptors-arm64.cc

Index: src/arm64/interface-descriptors-arm64.cc
diff --git a/src/arm64/interface-descriptors-arm64.cc b/src/arm64/interface-descriptors-arm64.cc
index c73d371e8fbfb9e2ac4ee05e594142dea3f4f715..0555a009b1d72288e276fb8dbfa2774f7235a047 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -57,11 +57,6 @@ const Register MathPowTaggedDescriptor::exponent() { return x11; }
 
 const Register MathPowIntegerDescriptor::exponent() { return x12; }
 
-const Register RegExpExecDescriptor::StringRegister() { return x0; }
-const Register RegExpExecDescriptor::LastIndexRegister() { return x1; }
-const Register RegExpExecDescriptor::StringStartRegister() { return x2; }
-const Register RegExpExecDescriptor::StringEndRegister() { return x3; }
-const Register RegExpExecDescriptor::CodeRegister() { return x8; }
 
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return x0; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return x3; }