Add CreateAlignmentAssumption to IRBuilder
Clang CodeGen had a utility function for creating pointer alignment assumptions
using the @llvm.assume intrinsic. This functionality will also be needed by the
inliner (to preserve function-argument alignment attributes when inlining), so
this moves the utility function into IRBuilder where it can be used both by
Clang CodeGen and also other LLVM-level code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219875
91177308-0d34-0410-b5e6-
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