[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #125635)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-tablegen

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/125635.diff


1 Files Affected:

- (modified) llvm/utils/TableGen/Common/CodeGenTarget.cpp (+3-2) 


``````````diff
diff --git a/llvm/utils/TableGen/Common/CodeGenTarget.cpp b/llvm/utils/TableGen/Common/CodeGenTarget.cpp
index fb9bb15feab3cf..e8286d295587fc 100644
--- a/llvm/utils/TableGen/Common/CodeGenTarget.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenTarget.cpp
@@ -262,8 +262,9 @@ void CodeGenTarget::ReadInstructions() const {
 
   // Parse the instructions defined in the .td file.
   for (const Record *R : Insts) {
-    Instructions[R] = std::make_unique<CodeGenInstruction>(R);
-    if (Instructions[R]->isVariableLengthEncoding())
+    auto &Inst = Instructions[R];
+    Inst = std::make_unique<CodeGenInstruction>(R);
+    if (Inst->isVariableLengthEncoding())
       HasVariableLengthEncodings = true;
   }
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/125635