[lit] Define PTR_SIZE for IRGenFileCheck.

Author: nate-chandler

test/lit.cfg

@@ -2862,7 +2862,7 @@ else:
 
 # A FileCheck that automatically supports a large variety of target
 # conditionalization that's useful in IRGen.
-IRGenFileCheck = '%s --check-prefix=CHECK --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s -DINT=i%s -D#CLASS_METADATA_HEADER=%s' % (
+IRGenFileCheck = '%s --check-prefix=CHECK --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s --check-prefix=CHECK-%s -DINT=i%s -DPTR_SIZE=%s -D#CLASS_METADATA_HEADER=%s' % (
         run_filecheck,
         run_os,
         run_cpu,
@@ -2871,6 +2871,7 @@ IRGenFileCheck = '%s --check-prefix=CHECK --check-prefix=CHECK-%s --check-prefix
         run_ptrauth,
         run_objc_interop,
         run_ptrsize,
+        run_ptrsize,
         run_class_metadata_header_size)
 config.substitutions.append( ('%IRGenFileCheck', IRGenFileCheck) )