[main] Source code updates from dotnet/dotnet

eng/Build.ps1

@@ -45,6 +45,8 @@ param (
     [switch]$procdump,
     [switch]$deployExtensions,
     [switch]$prepareMachine,
+    [bool][Alias('mt')]$msbuildMultiThreaded = $false,
+    [bool]$nodeReuse = $false,
     [switch]$useGlobalNuGetCache = $true,
     [switch]$dontUseGlobalNuGetCache = $false,
     [switch]$warnAsError = $true,
@@ -78,6 +80,7 @@ param (
 
 Set-StrictMode -version 2.0
 $ErrorActionPreference = "Stop"
+
 $BuildCategory = ""
 $BuildMessage = ""
 
@@ -140,6 +143,8 @@ function Print-Usage() {
     Write-Host "  -msbuildEngine <value>        Msbuild engine to use to run build ('dotnet', 'vs', or unspecified)."
     Write-Host "  -procdump                     Monitor test runs with procdump"
     Write-Host "  -prepareMachine               Prepare machine for CI run, clean up processes after build"
+    Write-Host "  -msbuildMultiThreaded <value> Sets MSBuild's multi-threaded mode, i.e. the -mt switch ('1' or '0') (short: -mt)"
+    Write-Host "  -nodeReuse <value>            Sets nodereuse msbuild parameter ('1' or '0')"
     Write-Host "  -dontUseGlobalNuGetCache      Do not use the global NuGet cache"
     Write-Host "  -noVisualStudio               Only build fsc and fsi as .NET Core applications. No Visual Studio required. '-configuration', '-verbosity', '-norestore', '-rebuild' are supported."
     Write-Host "  -productBuild                 Build the repository in product-build mode."

eng/Version.Details.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
-  <Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="7fb8cef14d9ae6bd729b04638f88d00f1ba7eb99" BarId="326361" />
+  <Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="7cdb217445905f3342bbb0266a4497b9a014389a" BarId="326717" />
   <ProductDependencies>
     <Dependency Name="Microsoft.Build" Version="18.10.0-preview-26357-08">
       <Uri>https://github.com/dotnet/msbuild</Uri>

eng/build.sh

@@ -34,6 +34,8 @@ usage()
   echo "  --skipAnalyzers                Do not run analyzers during build operations"
   echo "  --skipBuild                    Do not run the build"
   echo "  --prepareMachine               Prepare machine for CI run, clean up processes after build"
+  echo "  --msbuildMultiThreaded <value> Sets MSBuild's multi-threaded mode, i.e. the -mt switch ('true' or 'false') (short: --mt)"
+  echo "  --nodeReuse <value>            Sets nodereuse msbuild parameter ('true' or 'false')"
   echo "  --sourceBuild                  Build the repository in source-only mode."
   echo "  --productBuild                 Build the repository in product-build mode."
   echo "  --fromVMR                      Set when building from within the VMR"
@@ -75,6 +77,8 @@ ci=false
 skip_analyzers=false
 skip_build=false
 prepare_machine=false
+# Empty means "not specified"; tools.sh leaves it off unless it's explicitly requested.
+msbuild_multi_threaded=''
 source_build=false
 product_build=false
 from_vmr=false
@@ -167,6 +171,14 @@ while [[ $# > 0 ]]; do
     --preparemachine)
       prepare_machine=true
       ;;
+    --msbuildmultithreaded|--mt)
+      msbuild_multi_threaded=$2
+      shift
+      ;;
+    --nodereuse)
+      node_reuse=$2
+      shift
+      ;;
     --docker)
       docker=true
       ;;