[test] remove -primary-file flag as it's not needed

theblixguy · theblixguy · commit 77b6b1b1519a · 2019-04-19T01:35:23.000+01:00
diff --git a/test/IRGen/unmanaged_objc_throw_func.swift b/test/IRGen/unmanaged_objc_throw_func.swift
@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -emit-ir -primary-file %s | %FileCheck %s
+// RUN: %target-swift-frontend -emit-ir %s | %FileCheck %s
 
 import Foundation
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-// RUN: %target-swift-frontend -emit-ir -primary-file %s \| %FileCheck %s`
	`1`	`+// RUN: %target-swift-frontend -emit-ir %s \| %FileCheck %s`
`2`	`2`
`3`	`3`	`import Foundation`
`4`	`4`