[llvm] [GlobalISel] Add KnownFPClass printer pass (PR #225402)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-globalisel

Author: Tim Gymnich (tgymnich)

<details>
<summary>Changes</summary>

Adds a dedicated print<gisel-value-tracking-fpclass> machine-function pass.

Most KnownFPClassTest.cpp cases are migrated to MIR tests. The remaining unit test covers a signaling-NaN-specific query that the printer cannot represent.
 
Assisted by: gpt-5.6-sol

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Full diff: https://github.com/llvm/llvm-project/pull/225402.diff


9 Files Affected:

- (modified) llvm/include/llvm/CodeGen/GlobalISel/GISelValueTracking.h (+11) 
- (modified) llvm/include/llvm/Passes/MachinePassRegistry.def (+4-1) 
- (modified) llvm/lib/CodeGen/GlobalISel/GISelValueTracking.cpp (+32-8) 
- (added) llvm/test/CodeGen/AArch64/GlobalISel/knownfpclass-basic.mir (+72) 
- (added) llvm/test/CodeGen/AArch64/GlobalISel/knownfpclass-ops.mir (+1273) 
- (added) llvm/test/tools/UpdateTestChecks/update_givaluetracking_test_checks/Inputs/fpclass-const.mir (+12) 
- (added) llvm/test/tools/UpdateTestChecks/update_givaluetracking_test_checks/Inputs/fpclass-const.mir.expected (+13) 
- (modified) llvm/unittests/CodeGen/GlobalISel/KnownFPClassTest.cpp (+8-1871) 
- (modified) llvm/utils/update_givaluetracking_test_checks.py (+7-6) 


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</details>


https://github.com/llvm/llvm-project/pull/225402