[llvm] [clang] [clang-tools-extra] Dont alter cold function alignment unless using Os (PR #72387)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 2060bfcdc7eb704647c64bf925cdceb94c1f535f 
effbfe02b71638fe49dfc09423663f9077c4cc41 -- clang/test/CodeGen/cold-align.cpp 
clang/lib/CodeGen/CodeGenModule.cpp llvm/lib/CodeGen/MachineFunction.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/MachineFunction.cpp 
b/llvm/lib/CodeGen/MachineFunction.cpp
index ab5392a05f..9303ca787e 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -215,7 +215,7 @@ void MachineFunction::init() {
   // FIXME: Shouldn't use pref alignment if explicit alignment is set on F.
   // FIXME: Use Function::hasOptSize().
   if ((!F.hasFnAttribute(Attribute::OptimizeForSize)) ||
-     (F.getFnAttribute("keepalign").getValueAsBool()))
+      (F.getFnAttribute("keepalign").getValueAsBool()))
     Alignment = std::max(Alignment,
                          STI->getTargetLowering()->getPrefFunctionAlignment());
 

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https://github.com/llvm/llvm-project/pull/72387
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