Cleaning up il tests namespace doble uses

It seems there a few cases where namespaces and clases
are listed twice, like a declaration and definition.
IL_Transform tool does not like it and there is no need
to have this so I am removing.

Related PR #64837.

Author: BrianBohe

src/tests/JIT/Directed/shift/int8.il

@@ -21,47 +21,6 @@
   .hash algorithm 0x00008004
   .ver 0:0:0:0
 }
-// MVID: {DA4EAAAA-684F-4AB1-AC9B-90B895DBBD60}
-.imagebase 0x00400000
-.subsystem 0x00000003
-.file alignment 512
-.corflags 0x00000001
-// Image base: 0x06e80000
-//
-// ============== CLASS STRUCTURE DECLARATION ==================
-//
-.namespace ShiftTest
-{
-  .class public auto ansi beforefieldinit CL
-         extends [mscorlib]System.Object
-  {
-  } // end of class CL
-
-  .class public sequential ansi sealed beforefieldinit VT
-         extends [mscorlib]System.ValueType
-  {
-  } // end of class VT
-
-  .class public auto ansi beforefieldinit byte32Test
-         extends [mscorlib]System.Object
-  {
-  } // end of class byte32Test
-
-} // end of namespace ShiftTest
-
-
-// =============================================================
-
-
-// =============== GLOBAL FIELDS AND METHODS ===================
-
-
-// =============================================================
-
-
-// =============== CLASS MEMBERS DECLARATION ===================
-//   note that class flags, 'extends' and 'implements' clauses
-//          are provided here for information only
 
 .namespace ShiftTest
 {

src/tests/JIT/Directed/shift/nativeint.il

@@ -21,47 +21,6 @@
   .hash algorithm 0x00008004
   .ver 0:0:0:0
 }
-// MVID: {DA4EAAAA-684F-4AB1-AC9B-90B895DBBD60}
-.imagebase 0x00400000
-.subsystem 0x00000003
-.file alignment 512
-.corflags 0x00000001
-// Image base: 0x06e80000
-//
-// ============== CLASS STRUCTURE DECLARATION ==================
-//
-.namespace ShiftTest
-{
-  .class public auto ansi beforefieldinit CL
-         extends [mscorlib]System.Object
-  {
-  } // end of class CL
-
-  .class public sequential ansi sealed beforefieldinit VT
-         extends [mscorlib]System.ValueType
-  {
-  } // end of class VT
-
-  .class public auto ansi beforefieldinit byte32Test
-         extends [mscorlib]System.Object
-  {
-  } // end of class byte32Test
-
-} // end of namespace ShiftTest
-
-
-// =============================================================
-
-
-// =============== GLOBAL FIELDS AND METHODS ===================
-
-
-// =============================================================
-
-
-// =============== CLASS MEMBERS DECLARATION ===================
-//   note that class flags, 'extends' and 'implements' clauses
-//          are provided here for information only
 
 .namespace ShiftTest
 {

src/tests/JIT/Directed/shift/nativeuint.il

@@ -21,47 +21,6 @@
   .hash algorithm 0x00008004
   .ver 0:0:0:0
 }
-// MVID: {DA4EAAAA-684F-4AB1-AC9B-90B895DBBD60}
-.imagebase 0x00400000
-.subsystem 0x00000003
-.file alignment 512
-.corflags 0x00000001
-// Image base: 0x06e80000
-//
-// ============== CLASS STRUCTURE DECLARATION ==================
-//
-.namespace ShiftTest
-{
-  .class public auto ansi beforefieldinit CL
-         extends [mscorlib]System.Object
-  {
-  } // end of class CL
-
-  .class public sequential ansi sealed beforefieldinit VT
-         extends [mscorlib]System.ValueType
-  {
-  } // end of class VT
-
-  .class public auto ansi beforefieldinit byte32Test
-         extends [mscorlib]System.Object
-  {
-  } // end of class byte32Test
-
-} // end of namespace ShiftTest
-
-
-// =============================================================
-
-
-// =============== GLOBAL FIELDS AND METHODS ===================
-
-
-// =============================================================
-
-
-// =============== CLASS MEMBERS DECLARATION ===================
-//   note that class flags, 'extends' and 'implements' clauses
-//          are provided here for information only
 
 .namespace ShiftTest
 {