[CodeGen] Use MIR syntax for MachineMemOperand printing

Get rid of the "; mem:" suffix and use the one we use in MIR: ":: (load 2)".

rdar://38163529

Differential Revision: https://reviews.llvm.org/D42377

llvm-svn: 327580
diff --git a/llvm/test/CodeGen/PowerPC/byval-agg-info.ll b/llvm/test/CodeGen/PowerPC/byval-agg-info.ll
index ec53dee..21aa582 100644
--- a/llvm/test/CodeGen/PowerPC/byval-agg-info.ll
+++ b/llvm/test/CodeGen/PowerPC/byval-agg-info.ll
@@ -12,6 +12,6 @@
 }
 
 ; Make sure that the MMO on the store has no offset from the byval
-; variable itself (we used to have mem:ST8[%v+64]).
-; CHECK: STD killed renamable $x5, 176, $x1; mem:ST8[%v](align=16)
+; variable itself (we used to have (store 8 into %ir.v + 64)).
+; CHECK: STD killed renamable $x5, 176, $x1 :: (store 8 into %ir.v, align 16)