[llvm] [GlobalISel] Preserve cache hint metadata through IRTranslator (PR #224522)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-globalisel

Author: Yonah Goldberg (YonahGoldberg)

<details>
<summary>Changes</summary>

Preserve cache hint metadata when lowering from IR to gMIR. Supports loads/stores atomic loads/stores, atomicrmw, cmpxchg, memcpy, memmov, and memset and target memory intrinsics.

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Full diff: https://github.com/llvm/llvm-project/pull/224522.diff


6 Files Affected:

- (modified) llvm/include/llvm/CodeGen/GlobalISel/GenericMachineInstrs.h (+3-3) 
- (modified) llvm/include/llvm/CodeGen/TargetLowering.h (+9) 
- (modified) llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp (+36-18) 
- (modified) llvm/lib/Target/X86/X86ISelLowering.cpp (+8-8) 
- (added) llvm/test/CodeGen/Generic/GlobalISel/irtranslator-mem-cache-hint.ll (+86) 
- (added) llvm/test/CodeGen/Mips/GlobalISel/legalizer/mem-cache-hint.ll (+27) 


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</details>


https://github.com/llvm/llvm-project/pull/224522