Enable passing through special LLVM build modes from VMR outer build (#100822)

Author: directhex

eng/DotNetBuild.props

@@ -65,6 +65,9 @@
       <!-- Pass through special build modes controlled by properties -->
       <InnerBuildArgs Condition="'$(DotNetBuildRuntimeWasmEnableThreads)' == 'true'">$(InnerBuildArgs) /p:WasmEnableThreads=true</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(DotNetBuildRuntimeNativeAOTRuntimePack)' == 'true'">$(InnerBuildArgs) $(FlagParameterPrefix)s clr.nativeaotlibs+clr.nativeaotruntime+libs+packs /p:BuildNativeAOTRuntimePack=true /p:SkipLibrariesNativeRuntimePackages=true</InnerBuildArgs>
+      <InnerBuildArgs Condition="'$(DotNetBuildMonoEnableLLVM)' != ''">$(InnerBuildArgs) /p:MonoEnableLLVM=$(DotNetBuildMonoEnableLLVM)</InnerBuildArgs>
+      <InnerBuildArgs Condition="'$(DotNetBuildMonoAOTEnableLLVM)' != ''">$(InnerBuildArgs) /p:MonoAOTEnableLLVM=$(DotNetBuildMonoAOTEnableLLVM)</InnerBuildArgs>
+      <InnerBuildArgs Condition="'$(DotNetBuildMonoBundleLLVMOptimizer)' != ''">$(InnerBuildArgs) /p:MonoBundleLLVMOptimizer=$(DotNetBuildMonoBundleLLVMOptimizer)</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(PgoInstrument)' == 'true'">$(InnerBuildArgs) $(FlagParameterPrefix)pgoinstrument</InnerBuildArgs>
 
       <!-- This prop needs to be passed to the inner build manually as the BaseInnerSourceBuildCommand gets overriden above -->