Also add inreg to sreg that's added by CreateCallOrInvoke

This case was missed by #76159.

This is a partial fix for #74866

Author: hjyamauchi

lib/IRGen/GenCall.cpp

@@ -3556,6 +3556,8 @@ llvm::CallBase *IRBuilder::CreateCallOrInvoke(
         if (!ty)
           ty = func->getParamStructRetType(argIndex);
         builder.addStructRetAttr(ty);
+        if (func->hasParamAttribute(argIndex, llvm::Attribute::InReg))
+          builder.addAttribute(llvm::Attribute::InReg);
         attrs = attrs.addParamAttributes(func->getContext(), argIndex, builder);
       }
       if (func->hasParamAttribute(argIndex, llvm::Attribute::ByVal)) {

test/Interop/Cxx/class/method/Inputs/inreg-sret.h

@@ -0,0 +1,11 @@
+#ifndef TEST_INTEROP_CXX_CLASS_METHOD_INREG_SRET_H
+#define TEST_INTEROP_CXX_CLASS_METHOD_INREG_SRET_H
+
+struct OptionalBridgedBasicBlock {
+};
+
+struct BridgedFunction {
+  OptionalBridgedBasicBlock getFirstBlock() const { return {}; }
+};
+
+#endif // TEST_INTEROP_CXX_CLASS_METHOD_INREG_SRET_H

test/Interop/Cxx/class/method/Inputs/module.modulemap

@@ -14,3 +14,8 @@ module UnsafeProjections {
 
   export *
 }
+
+module InRegSRet {
+  header "inreg-sret.h"
+  requires cplusplus
+}

test/Interop/Cxx/class/method/inreg-sret.swift

@@ -0,0 +1,28 @@
+// RUN: %target-swift-emit-irgen -I %S/Inputs -cxx-interoperability-mode=default %s | %FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-%target-cpu
+
+// REQUIRES: OS=windows-msvc
+
+import InRegSRet
+
+final public class BasicBlock {
+}
+
+extension OptionalBridgedBasicBlock {
+  public var block: BasicBlock? { nil }
+}
+
+final public class Function {
+  public var bridged: BridgedFunction {
+    BridgedFunction()
+  }
+
+  public var firstBlock : BasicBlock? { bridged.getFirstBlock().block }
+}
+
+// Check that inreg on the sret isn't missing
+
+// CHECK-x86_64: call void @"?getFirstBlock@BridgedFunction@@QEBA?AUOptionalBridgedBasicBlock@@XZ"(ptr {{.*}}, ptr sret(%struct.OptionalBridgedBasicBlock) {{.*}})
+// CHECK-aarch64: call void @"?getFirstBlock@BridgedFunction@@QEBA?AUOptionalBridgedBasicBlock@@XZ"(ptr {{.*}}, ptr inreg sret(%struct.OptionalBridgedBasicBlock) {{.*}})
+
+// CHECK-x86_64: define {{.*}} void @"?getFirstBlock@BridgedFunction@@QEBA?AUOptionalBridgedBasicBlock@@XZ"(ptr {{.*}} %{{.*}}, ptr noalias sret(%struct.OptionalBridgedBasicBlock) {{.*}} %{{.*}})
+// CHECK-aarch64: define {{.*}} void @"?getFirstBlock@BridgedFunction@@QEBA?AUOptionalBridgedBasicBlock@@XZ"(ptr {{.*}} %{{.*}}, ptr inreg noalias sret(%struct.OptionalBridgedBasicBlock) {{.*}} %{{.*}})