[codegen] Move definition of GetRegisterParameter to inline header

This fixes compilation of V8 in Node.js with Visual Studio 2019.
Without this change, MSVC errors with C3779 (a function that returns
'auto' cannot be used before it is defined) on the `static constexpr
auto registers()` method.

Bug: v8:11420
Change-Id: Id545199e2cdc10c8560031fb5950ec1171e5d554
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2964095
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75173}

src/codegen/interface-descriptors-inl.h

@@ -180,6 +180,13 @@ StaticCallInterfaceDescriptor<DerivedDescriptor>::GetStackParameterCount() {
          DerivedDescriptor::GetRegisterParameterCount();
 }
 
+// static
+template <typename DerivedDescriptor>
+constexpr Register
+StaticCallInterfaceDescriptor<DerivedDescriptor>::GetRegisterParameter(int i) {
+  return DerivedDescriptor::registers()[i];
+}
+
 // static
 constexpr Register FastNewObjectDescriptor::TargetRegister() {
   return kJSFunctionRegister;

src/codegen/interface-descriptors.h

@@ -469,10 +469,8 @@ class StaticCallInterfaceDescriptor : public CallInterfaceDescriptor {
   static constexpr inline int GetRegisterParameterCount();
   static constexpr inline int GetStackParameterCount();
   static constexpr inline Register* GetRegisterData();
+  static constexpr inline Register GetRegisterParameter(int i);
 
-  static constexpr inline Register GetRegisterParameter(int i) {
-    return DerivedDescriptor::registers()[i];
-  }
   explicit StaticCallInterfaceDescriptor(CallDescriptors::Key key)
       : CallInterfaceDescriptor(key) {}