Invoke crossgen exe when building R2RTest (#111881)

Given the way crossgen is built in-tree, we no longer have crossgen.dll, but rather the actual crossgen executable.

Should fix #111878

Author: steveisok

eng/pipelines/common/xplat-setup.yml

@@ -71,6 +71,8 @@ jobs:
           value: zip
         - name: tarCompression
           value: ''
+        - name: exeExt
+          value: '.exe'
         - name: scriptExt
           value: '.cmd'
         - name: dir
@@ -91,6 +93,8 @@ jobs:
           value: tar
         - name: tarCompression
           value: gz
+        - name: exeExt
+          value: ''
         - name: scriptExt
           value: '.sh'
         - name: dir

eng/pipelines/coreclr/templates/crossgen2-comparison-build-job.yml

@@ -69,10 +69,7 @@ jobs:
       - name: target_crossgen2_os
         value: osx
     - name: crossgen2location
-      value: $(productDirectory)$(dir)$(targetFlavor)$(dir)crossgen2$(dir)crossgen2.dll
-    - ${{ if ne(parameters.archType, 'x64') }}:
-      - name: crossgen2location
-        value: $(productDirectory)$(dir)$(targetFlavor)$(dir)x64$(dir)crossgen2$(dir)crossgen2.dll
+      value: $(binDirectory)$(dir)crossgen2_inbuild$(dir)$(archType)$(dir)$(buildConfigUpper)$(dir)crossgen2.dll
     - name: librariesProductDllDir
       value: $(Build.SourcesDirectory)$(dir)artifacts$(dir)bin$(dir)runtime$(dir)net10.0-$(osGroup)$(osSubgroup)-$(buildConfig)-$(archType)
 

src/tests/build.proj

@@ -688,8 +688,7 @@
       <CrossgenCmd Condition="'$(__CompositeBuildMode)' == ''">$(CrossgenCmd) --crossgen2-parallelism 1</CrossgenCmd>
 
       <CrossgenCmd>$(CrossgenCmd) --verify-type-and-field-layout</CrossgenCmd>
-      <CrossgenCmd Condition="'$(RunningOnUnix)' == 'true'">$(CrossgenCmd) --crossgen2-path "$(__BinDir)\$(BuildArchitecture)\crossgen2\crossgen2"</CrossgenCmd>
-      <CrossgenCmd Condition="'$(RunningOnUnix)' != 'true'">$(CrossgenCmd) --crossgen2-path "$(__BinDir)\$(BuildArchitecture)\crossgen2\crossgen2.exe"</CrossgenCmd>
+      <CrossgenCmd>$(CrossgenCmd) --crossgen2-path "$(__BinDir)\$(BuildArchitecture)\crossgen2\crossgen2$(ExeSuffix)"</CrossgenCmd>
     </PropertyGroup>
 
     <Message Importance="High" Text="$(MsgPrefix)Compiling framework using Crossgen2: $(CrossgenCmd)" />