[mips] Clean up the CodeGen/Mips/inlineasmmemop.ll test. NFC.

[tomatabacu]

Summary

Improve comments and remove a redundant attribute list.
There are no functional changes (to the CHECK's or to the code).

Part of these changes were suggested in http://reviews.llvm.org/D6637.

[dsanders]

LGTM. You ought to have made these changes before committing r224425.

test/CodeGen/Mips/inlineasmmemop.ll

; CHECK: sw  $[[T3]], 0($[[T1]])
   %l1 = alloca i32, align 4
   call void asm "sw $1, $0", "=*m,r"(i32* %l1, i32 %x) nounwind
   %0 = call i32 asm "lw $0, $1", "=r,*m"(i32* %l1) nounwind
   store i32 %0, i32* @g1, align 4
   ret i32 %0
 }
 
 ; CHECK-LABEL: main:
-; "D": Second word of double word. This works for any memory element
+; "D": Second word of a double word. This works for any memory element
 ; double or single.
 ; CHECK: #APP
 ; CHECK: lw ${{[0-9]+}},4(${{[0-9]+}});
 ; CHECK: #NO_APP
 
-; No "D": First word of double word. This works for any memory element 
+; No "D": First word of a double word. This works for any memory element
 ; double or single.
 ; CHECK: #APP
 ; CHECK: lw ${{[0-9]+}},0(${{[0-9]+}});
 ; CHECK: #NO_APP
 
-;int b[8] = {0,1,2,3,4,5,6,7};
-;int main()
-;{
-;  int i;
-; 
-;  // The first word. Notice, no 'D'
-;  { asm (
-;    "lw    %0,%1;\n"
-;    : "=r" (i) : "m" (*(b+4)));}
-; 
-;  // The second word
-;  { asm (
-;    "lw    %0,%D1;\n"
-;    : "=r" (i) "m" (*(b+4)));}
-;}
-
 @b = common global [20 x i32] zeroinitializer, align 4
 
 define void @main() {
 entry:
+; Second word:
   tail call void asm sideeffect "    lw    $0,${1:D};", "r,*m,~{$11}"(i32 undef, i32* getelementptr inbounds ([20 x i32]* @b, i32 0, i32 3))
+; First word. Notice, no 'D':
   tail call void asm sideeffect "    lw    $0,${1};", "r,*m,~{$11}"(i32 undef, i32* getelementptr inbounds ([20 x i32]* @b, i32 0, i32 3))
   ret void
 }
-
-attributes #0 = { nounwind }
-