[llvm] [VPlan] Add VPlan-dump-based test for predication (PR #180794)

[Andrei Elovikov via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -disable-output < %s -p loop-vectorize -vplan-print-after=introduceMasksAndLinearize -vplan-print-limit-to-vector-region 2>&1 | FileCheck %s
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eas wrote:

#180611 has gotten a few LGTMs and we'll probably be merged before this, so I'm just moving the test under `VPlan/` here, thanks.

https://github.com/llvm/llvm-project/pull/180794