Remove async method inlining restrictions in crossgen2

src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/InliningInfoNode.cs

@@ -72,11 +72,6 @@ public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
                     continue;
                 }
                 MethodDesc inliner = methodNode.Method;
-                if (inliner.IsCompilerGeneratedILBodyForAsync())
-                {
-                    // Async thunks are restricted from inlining. https://github.com/dotnet/runtime/issues/124665
-                    continue;
-                }
                 EcmaMethod inlinerDefinition = (EcmaMethod)inliner.GetPrimaryMethodDesc().GetTypicalMethodDefinition();
 
                 if (inlinerDefinition.IsNonVersionable())

src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/ReadyToRunCodegenCompilation.cs

@@ -109,12 +109,6 @@ public bool CanInline(MethodDesc caller, MethodDesc callee)
                 }
             }
 
-            // TODO: Enable async inlining. https://github.com/dotnet/runtime/issues/124665
-            if (callee.IsAsyncThunk() || callee.IsAsyncCall())
-            {
-                return false;
-            }
-
             _nodeFactory.DetectGenericCycles(caller, callee);
 
             return NodeFactory.CompilationModuleGroup.CanInline(caller, callee);

src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/ReadyToRunCompilationModuleGroupBase.cs

@@ -520,10 +520,6 @@ private bool CrossModuleInlineableInternal(MethodDesc method)
 
         private bool CrossModuleInlineableUncached(MethodDesc method)
         {
-            // Async thunks and variants cannot currently be inlined cross module
-            if (method.IsAsyncVariant() || method.IsAsync || method.IsAsyncThunk())
-                return false;
-
             // Defined in corelib
             MetadataType owningMetadataType = method.OwningType.GetTypeDefinition() as MetadataType;
             if (owningMetadataType == null)

src/coreclr/tools/aot/ILCompiler.ReadyToRun/JitInterface/CorInfoImpl.ReadyToRun.cs

@@ -3308,17 +3308,6 @@ private void reportInliningDecision(CORINFO_METHOD_STRUCT_* inlinerHnd, CORINFO_
 
                 var typicalMethod = inlinee.GetTypicalMethodDefinition();
 
-                if ((typicalMethod.IsAsyncVariant() || typicalMethod.IsAsync || typicalMethod.IsCompilerGeneratedILBodyForAsync()) && !_compilation.CompilationModuleGroup.VersionsWithMethodBody(typicalMethod))
-                {
-                    // TODO: fix this restriction in runtime async. https://github.com/dotnet/runtime/issues/124665
-                    // Disable async methods in cross module inlines for now, we need to trigger the CheckILBodyFixupSignature in the right situations, and that hasn't been implemented
-                    // yet. Currently, we'll correctly trigger the _ilBodiesNeeded logic below, but we also need to avoid triggering the ILBodyFixupSignature for the async thunks, but we ALSO need to make
-                    // sure we generate the CheckILBodyFixupSignature for the actual runtime-async body in which case I think the typicalMethod will be an AsyncVariantMethod, which doesn't appear
-                    // to be handled here. This check is here in the place where I believe we actually would behave incorrectly, but we also have a check in CrossModuleInlineable which disallows
-                    // the cross module inline of async methods currently.
-                    throw new Exception("Inlining async methods is not supported in ReadyToRun compilation.");
-                }
-
                 MethodIL methodIL = _compilation.GetMethodIL(typicalMethod);
                 if (methodIL is ILStubMethodIL ilStubMethodIL && ilStubMethodIL.StubILHasGeneratedTokens)
                 {