[llvm] [BranchProbabilityInfo][NFC] Remove some global ctors (PR #208252)

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@llvm/pr-subscribers-llvm-support

@llvm/pr-subscribers-llvm-analysis

Author: Alexis Engelke (aengelke)

<details>
<summary>Changes</summary>

Make BranchProbability constexpr and replace global std::map with
switches.


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Full diff: https://github.com/llvm/llvm-project/pull/208252.diff


4 Files Affected:

- (modified) llvm/include/llvm/Analysis/BranchProbabilityInfo.h (+2-3) 
- (modified) llvm/include/llvm/Support/BranchProbability.h (+21-7) 
- (modified) llvm/lib/Analysis/BranchProbabilityInfo.cpp (+74-90) 
- (modified) llvm/lib/Support/BranchProbability.cpp (-12) 


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</details>


https://github.com/llvm/llvm-project/pull/208252