[llvm] [AMDGPU][GlobalISel] Add RegBankLegalize rules for TFE buffer loads (PR #179529)

[Petar Avramovic via llvm-commits]

================
@@ -1181,6 +1181,11 @@ LLT RegBankLegalizeHelper::getBTyFromID(RegBankLLTMappingApplyID ID, LLT Ty) {
         isAnyPtr(Ty, 128))
       return Ty;
     return LLT();
+  case VgprB160:
+  case UniInVgprB160:
+    if (Ty == LLT::scalar(160) || Ty == LLT::fixed_vector(5, 32))
+      return Ty;
+    return LLT();
----------------
petar-avramovic wrote:

```suggestion
    if (Ty.getSizeInBits() == 160)
      return Ty;
    return LLT();
```

https://github.com/llvm/llvm-project/pull/179529