[NFC] Remove vestigial IBActionAttr checks

isObjC() has learned to check for IBActionAttr, so these checks are redundant.

Author: beccadax

lib/IRGen/GenObjC.cpp

@@ -1415,7 +1415,7 @@ bool irgen::requiresObjCMethodDescriptor(FuncDecl *method) {
   if (isa<AccessorDecl>(method))
     return false;
 
-  return method->isObjC() || method->getAttrs().hasAttribute<IBActionAttr>();
+  return method->isObjC();
 }
 
 bool irgen::requiresObjCMethodDescriptor(ConstructorDecl *constructor) {

lib/SILGen/SILGenType.cpp

@@ -159,7 +159,7 @@ bool SILGenModule::requiresObjCMethodEntryPoint(FuncDecl *method) {
   if (method->getAttrs().hasAttribute<NSManagedAttr>())
     return false;
 
-  return method->isObjC() || method->getAttrs().hasAttribute<IBActionAttr>();
+  return method->isObjC();
 }
 
 bool SILGenModule::requiresObjCMethodEntryPoint(ConstructorDecl *constructor) {