Merging r328755:

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r328755 | gbiv | 2018-03-28 20:12:03 -0700 (Wed, 28 Mar 2018) | 10 lines

[MemorySSA] Turn an assert into a condition

Eli pointed out that variadic functions are totally a thing, so this
assert is incorrect.

No test-case is provided, since the only way this assert fires is if a
specific DenseMap falls back to doing `isEqual` checks, and that seems
fairly brittle (and requires a pyramid of growing
`call void (i8, ...) @VarArgs(i8 0)`).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@329670 91177308-0d34-0410-b5e6-96231b3b80d8

Author: tstellar

lib/Analysis/MemorySSA.cpp

@@ -159,8 +159,8 @@ class MemoryLocOrCall {
     if (CS.getCalledValue() != Other.CS.getCalledValue())
       return false;
 
-    assert(CS.arg_size() == Other.CS.arg_size());
-    return std::equal(CS.arg_begin(), CS.arg_end(), Other.CS.arg_begin());
+    return CS.arg_size() == Other.CS.arg_size() &&
+           std::equal(CS.arg_begin(), CS.arg_end(), Other.CS.arg_begin());
   }
 
 private: