Add test on missing original file

[Cherry-picked cc8b04a]

Author: Linyxus

tests/neg/magic-offset-header-c_wrapper.check

@@ -1,6 +1,5 @@
-bad option '-Xmagic-offset-header:SOURCE_CODE_START_MARKER' was ignored
--- [E007] Type Mismatch Error: tests/neg/magic-offset-header-c_wrapper.scala:8:18 --------------------------------------
-8 |  val x: String = 0  // anypos-error
+-- [E007] Type Mismatch Error: tests/neg/magic-offset-header-c.scala:3:18 ----------------------------------------------
+3 |  val x: String = 0  // error
   |                  ^
   |                  Found:    (0 : Int)
   |                  Required: String

tests/neg/magic-offset-header-c_wrapper.scala

@@ -1,4 +1,4 @@
-//> using options -Xmagic-offset-header:SOURCE_CODE_START_MARKER
+//> using options -Ymagic-offset-header:SOURCE_CODE_START_MARKER
 
 val generatedCode = 123
 

tests/neg/magic-offset-header-d_wrapper.check

@@ -0,0 +1,15 @@
+original source file not found: something_nonexist.scala
+-- [E007] Type Mismatch Error: tests/neg/magic-offset-header-d_wrapper.scala:3:20 --------------------------------------
+3 |def test1: String = 0 // error
+  |                    ^
+  |                    Found:    (0 : Int)
+  |                    Required: String
+  |
+  | longer explanation available when compiling with `-explain`
+-- [E007] Type Mismatch Error: tests/neg/magic-offset-header-d_wrapper.scala:5:17 --------------------------------------
+5 |def test2: Int = "0" // error
+  |                 ^^^
+  |                 Found:    ("0" : String)
+  |                 Required: Int
+  |
+  | longer explanation available when compiling with `-explain`

tests/neg/magic-offset-header-d_wrapper.scala

@@ -0,0 +1,5 @@
+//> using options -Ymagic-offset-header:SOURCE_CODE_START_MARKER
+
+def test1: String = 0 // error
+///SOURCE_CODE_START_MARKER:something_nonexist.scala
+def test2: Int = "0" // error