Rename IsCore to IsCoreCLR

test/powershell/Language/Parser/MethodInvocation.Tests.ps1

@@ -1,4 +1,4 @@
-if ( $IsCore ) {
+if ( $IsCoreCLR ) {
     return
 }
 

test/powershell/Language/Parser/TypeAccelerator.Tests.ps1

@@ -11,7 +11,7 @@ Describe "Type accelerators" -Tags "DRT" {
     }
 
     It "Can query type accelerators" {
-        if ( $IsCore ) { $count = 80 } else { $count = 82 }
+        if ( $IsCoreCLR ) { $count = 80 } else { $count = 82 }
         $TypeAccelerators.Count -gt $count | Should Be $true
         $TypeAccelerators['xml'] | Should Be ([System.Xml.XmlDocument])
         $TypeAccelerators['AllowNull'] | Should Be ([System.Management.Automation.AllowNullAttribute])