Enable "Whole Program Optimization".

Author: Taogle2018

gvm/gvm.vcxproj

@@ -54,6 +54,7 @@
     <SpectreMitigation>false</SpectreMitigation>
     <DriverTargetPlatform>Desktop</DriverTargetPlatform>
     <_NT_TARGET_VERSION>0x0601</_NT_TARGET_VERSION>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <TargetVersion>Windows7</TargetVersion>
@@ -64,6 +65,7 @@
     <SpectreMitigation>false</SpectreMitigation>
     <DriverTargetPlatform>Desktop</DriverTargetPlatform>
     <_NT_TARGET_VERSION>0x0601</_NT_TARGET_VERSION>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="PropertySheets">