Revert of [regexp] Remove remainder of native RegExpExecStub

src/ia32/interface-descriptors-ia32.cc

Index: src/ia32/interface-descriptors-ia32.cc
diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
index c49a6fd4855db0b3ccfa63740d7c8bdab76129d4..304191bbd2747f9d208a252ec52d7763e6d1e1cb 100644
--- a/src/ia32/interface-descriptors-ia32.cc
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -56,6 +56,11 @@
   return MathPowTaggedDescriptor::exponent();
 }
 
+const Register RegExpExecDescriptor::StringRegister() { return eax; }
+const Register RegExpExecDescriptor::LastIndexRegister() { return ecx; }
+const Register RegExpExecDescriptor::StringStartRegister() { return edx; }
+const Register RegExpExecDescriptor::StringEndRegister() { return ebx; }
+const Register RegExpExecDescriptor::CodeRegister() { return edi; }
 
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return eax; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return ebx; }