Pete Cooper c653b44276 Add const to a bunch of Type* in DataLayout. NFC.
Almost all methods in DataLayout took mutable pointers but didn't need to.
These were only accessing constant methods of the types, or using the Type*
to key a map.  Neither of these needs a mutable pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243135 91177308-0d34-0410-b5e6-96231b3b80d8
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