Fixup use-native-low-precision.ll test to use the updated module flag descriptions

Author: Icohedron

llvm/test/CodeGen/DirectX/ShaderFlags/use-native-low-precision.ll

@@ -7,8 +7,8 @@ target triple = "dxil-pc-shadermodel6.7-library"
 ;CHECK-NEXT: ;
 ;CHECK-NEXT: ; Note: shader requires additional functionality:
 ;CHECK-NEXT: ; Note: extra DXIL module flags:
-;CHECK-NEXT: ;       D3D11_1_SB_GLOBAL_FLAG_ENABLE_MINIMUM_PRECISION
-;CHECK-NEXT: ;       Native 16bit types enabled
+;CHECK-NEXT: ;       Low-precision data types
+;CHECK-NEXT: ;       Use native low precision
 ;CHECK-NEXT: ;
 ;CHECK-NEXT: ; Shader Flags for Module Functions