[AMDGPU] Fixed MSVC build break

Error was:

field of type 'llvm::ArgDescriptor' has private default constructor
const AMDGPUFunctionArgInfo AMDGPUArgumentUsageInfo::ExternFunctionInfo{};
                                                                        ^

llvm-svn: 310048

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h
index 9373b80..bf96355 100644 (file)
--- a/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h
@@ -26,6 +26,7 @@ class TargetRegisterInfo;
 struct ArgDescriptor {
 private:
   friend struct AMDGPUFunctionArgInfo;
+  friend class AMDGPUArgumentUsageInfo;
 
   union {
     unsigned Register;