[llvm] [VPlan] Use BlockFrequencyInfo's full mass for execution frequencies. (PR #227006)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Florian Hahn (fhahn)

<details>
<summary>Changes</summary>

Use BlockFrequencyInfo's full mass instead of custom 2^63 for "always execute".

This updates VPlan's block frequencies to match BFI.

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Full diff: https://github.com/llvm/llvm-project/pull/227006.diff


7 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp (+6-3) 
- (modified) llvm/lib/Transforms/Vectorize/VPlanUtils.cpp (+4-3) 
- (modified) llvm/lib/Transforms/Vectorize/VPlanUtils.h (+1-6) 
- (modified) llvm/test/Transforms/LoopVectorize/VPlan/execution-frequencies-match-bfi.ll (+89-89) 
- (modified) llvm/test/Transforms/LoopVectorize/VPlan/record-execution-frequencies.ll (+11-11) 
- (modified) llvm/test/Transforms/LoopVectorize/VPlan/vplan-based-stride-mv.ll (+3-3) 
- (modified) llvm/test/Transforms/LoopVectorize/VPlan/vplan-printing-branch-weights.ll (+5-5) 


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</details>


https://github.com/llvm/llvm-project/pull/227006