[clang] Implement `ByteAddressBuffer` Load/Store methods (PR #176058)

[Helena Kotas via cfe-commits]

================
@@ -142,9 +142,222 @@ RESOURCE Buffer;
 // CHECK-NEXT: DeclRefExpr {{.*}} 'hlsl::[[RESOURCE]]' lvalue Var {{.*}} 'tmp' 'hlsl::[[RESOURCE]]'
 // CHECK-NEXT: AlwaysInlineAttr {{.*}} Implicit always_inline
 
+// Load methods
+
+// CHECK-LOAD: CXXMethodDecl {{.*}} Load 'unsigned int (unsigned int)'
+// CHECK-LOAD-NEXT: ParmVarDecl {{.*}} Index 'unsigned int'
+// CHECK-LOAD-NEXT: CompoundStmt
+// CHECK-LOAD-NEXT: ReturnStmt
+// CHECK-LOAD-NEXT: UnaryOperator {{.*}} 'hlsl_device unsigned int' lvalue prefix '*' cannot overflow
+// CHECK-LOAD-NEXT: CallExpr {{.*}} 'hlsl_device unsigned int *'
+// CHECK-LOAD-NEXT: ImplicitCastExpr {{.*}} 'void (*)(...) noexcept' <BuiltinFnToFnPtr>
+// CHECK-LOAD-NEXT: DeclRefExpr {{.*}} '<builtin fn type>' Function {{.*}} '__builtin_hlsl_resource_getpointer' 'void (...) noexcept'
+// CHECK-LOAD-NEXT: MemberExpr {{.*}} '__hlsl_resource_t {{.*}}' lvalue .__handle
+// CHECK-LOAD-NEXT: CXXThisExpr {{.*}} 'hlsl::[[RESOURCE]]' lvalue implicit this
+// CHECK-LOAD-NEXT: DeclRefExpr {{.*}} 'unsigned int' ParmVar {{.*}} 'Index' 'unsigned int'
+// CHECK-LOAD-NEXT: AlwaysInlineAttr {{.*}} Implicit always_inline
+// CHECK-LOAD: CXXMethodDecl {{.*}} Load 'unsigned int (unsigned int, out unsigned int)
----------------
hekota wrote:

```suggestion

// CHECK-LOAD: CXXMethodDecl {{.*}} Load 'unsigned int (unsigned int, out unsigned int)
```
Nit - it would be good to separate the different Load overloads by new line for better readability.

https://github.com/llvm/llvm-project/pull/176058