build.ps1: shuffle build order

Build the complete toolchain before we build the SDK. This delays a
certain class of errors, however, the resulting build order is much
easier to reason about.

Author: compnerd

utils/build.ps1

@@ -4264,24 +4264,18 @@ if (-not $SkipBuild) {
   Invoke-BuildStep Build-IndexStoreDB $HostPlatform
   Invoke-BuildStep Build-SourceKitLSP $HostPlatform
   Invoke-BuildStep Build-Inspect $HostPlatform
-}
 
-Install-HostToolchain
+  Install-HostToolchain
 
-if (-not $SkipBuild) {
   Invoke-BuildStep Build-mimalloc $HostPlatform
-}
 
-if (-not $SkipBuild -and $IncludeNoAsserts) {
-  Build-NoAssertsToolchain
-}
+  if ($IncludeNoAsserts) {
+    Build-NoAssertsToolchain
+  }
 
-if (-not $SkipBuild) {
   Invoke-BuildStep Build-SymbolKit $HostPlatform
   Invoke-BuildStep Build-DocC $HostPlatform
-}
 
-if (-not $SkipBuild) {
   Invoke-BuildStep Patch-mimalloc $HostPlatform
 }