Tests: Split out RunCMake.GeneratorToolset Xcode checks

This will allow the behavior of VS and Xcode generators to differ.

Tests/RunCMake/GeneratorToolset/BadToolsetHostArchXcode-result.txt

+1

Tests/RunCMake/GeneratorToolset/BadToolsetHostArchXcode-stderr.txt

+CMake Error at CMakeLists.txt:[0-9]+ \(project\):
+  Generator
+
+    .*
+
+  does not recognize the toolset
+
+    Test Toolset,host=x6[45]
+
+  that was specified\.$

Tests/RunCMake/GeneratorToolset/BadToolsetHostArchXcode.cmake

+message(FATAL_ERROR "This should not be reached!")

Tests/RunCMake/GeneratorToolset/RunCMakeTest.cmake

@@ -3,7 +3,7 @@ include(RunCMake)
 set(RunCMake_GENERATOR_TOOLSET "")
 run_cmake(NoToolset)
 
-if("${RunCMake_GENERATOR}" MATCHES "Visual Studio 1[01245]|Xcode" AND NOT XCODE_BELOW_3)
+if("${RunCMake_GENERATOR}" MATCHES "Visual Studio 1[01245]")
   set(RunCMake_GENERATOR_TOOLSET "Test Toolset")
   run_cmake(TestToolset)
   if("${RunCMake_GENERATOR}" MATCHES "Visual Studio 1[245]")
@@ -21,6 +21,11 @@ if("${RunCMake_GENERATOR}" MATCHES "Visual Studio 1[01245]|Xcode" AND NOT XCODE_
     set(RunCMake_GENERATOR_TOOLSET "Test Toolset,host=x64")
     run_cmake(BadToolsetHostArch)
   endif()
+elseif("${RunCMake_GENERATOR}" STREQUAL "Xcode" AND NOT XCODE_BELOW_3)
+  set(RunCMake_GENERATOR_TOOLSET "Test Toolset")
+  run_cmake(TestToolset)
+  set(RunCMake_GENERATOR_TOOLSET "Test Toolset,host=x64")
+  run_cmake(BadToolsetHostArchXcode)
 else()
   set(RunCMake_GENERATOR_TOOLSET "Bad Toolset")
   run_cmake(BadToolset)