[CodeGen] Do not emit call site attributes for LLVM intrinsics.

clang/lib/CodeGen/CGCall.cpp

@@ -5793,8 +5793,14 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
   }
 
   // Apply the attributes and calling convention.
-  CI->setAttributes(Attrs);
-  CI->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
+
+  // If this is a call to an intrinsic, ignore the attributes that would
+  // normally be deduced from the AST function declaration + the default
+  // attributes imposed by the language and/or target.
+  if (!isa<llvm::IntrinsicInst>(CI)) {
+    CI->setAttributes(Attrs);
+    CI->setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
+  }
 
   // Apply various metadata.
 

clang/test/CodeGen/llvm-intrinsic-call.c

@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+
+float llvm_sin_f32(float) asm("llvm.sin.f32");
+
+float test(float a) {
+  return llvm_sin_f32(a);
+}
+
+// CHECK: call float @llvm.sin.f32(float {{%.+}}){{$}}
+
+// CHECK: declare float @llvm.sin.f32(float) [[ATTRS:#[0-9]+]]
+
+// CHECK: attributes [[ATTRS]] = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

clang/test/CodeGenCUDA/surface.cu

@@ -29,7 +29,7 @@ __attribute__((device)) int suld_2d_zero(surface<void, 2>, int, int) asm("llvm.n
 
 // DEVICE-LABEL: i32 @_Z3fooii(i32 noundef %x, i32 noundef %y)
 // DEVICE: call i64 @llvm.nvvm.texsurf.handle.internal.p1(ptr addrspace(1) @surf)
-// DEVICE: call noundef i32 @llvm.nvvm.suld.2d.i32.zero(i64 %{{.*}}, i32 noundef %{{.*}}, i32 noundef %{{.*}})
+// DEVICE: call i32 @llvm.nvvm.suld.2d.i32.zero(i64 %{{.*}}, i32 %{{.*}}, i32 %{{.*}})
 __attribute__((device)) int foo(int x, int y) {
   return suld_2d_zero(surf, x, y);
 }