https://bugs.llvm.org/show_bug.cgi?id=51457

            Bug ID: 51457
           Summary: Attributor may attempt to truncate a smaller value to
                    a larger one
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedb...@nondot.org
          Reporter: jdoerf...@anl.gov
                CC: llvm-bugs@lists.llvm.org
            Blocks: 51236

While casting constants we did not explicitly check if the types were larger
before calling CreateTrunc, this crashed:

  store i32 42, i32* @bytes2                                                    
  %bc = bitcast i32* @bytes2 to i64*                                            
  %l = load i64, i64* %bc


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=51236
[Bug 51236] [meta] 13.0.0 Release Blockers
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