[llvm] [Docs] Fix a DIExpression fragment example (PR #214839)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: Eric Christopher (echristo)

<details>
<summary>Changes</summary>

Use DW_OP_LLVM_fragment for the source-variable fragment example. The previous DW_OP_bit_piece form is not valid in LLVM DIExpression metadata - the other code was changed a bit ago, this is just some documentation that didn't catch up.

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Full diff: https://github.com/llvm/llvm-project/pull/214839.diff


1 Files Affected:

- (modified) llvm/docs/LangRef.md (+1-1) 


``````````diff
diff --git a/llvm/docs/LangRef.md b/llvm/docs/LangRef.md
index 6a3194271b838..9c35cd920ad2e 100644
--- a/llvm/docs/LangRef.md
+++ b/llvm/docs/LangRef.md
@@ -7207,7 +7207,7 @@ Some examples of expressions:
 !DIExpression(DW_OP_deref)
 !DIExpression(DW_OP_plus_uconst, 3)
 !DIExpression(DW_OP_constu, 3, DW_OP_plus)
-!DIExpression(DW_OP_bit_piece, 3, 7)
+!DIExpression(DW_OP_LLVM_fragment, 3, 7)
 !DIExpression(DW_OP_deref, DW_OP_constu, 3, DW_OP_plus, DW_OP_LLVM_fragment, 3, 7)
 !DIExpression(DW_OP_constu, 2, DW_OP_swap, DW_OP_xderef)
 !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)

``````````

</details>


https://github.com/llvm/llvm-project/pull/214839