[clang] Revert "[clang-repl] Enable native CPU detection by default (#77491)" (PR #79178)

[Stefan Gränitz via cfe-commits]

https://github.com/weliveindetail created https://github.com/llvm/llvm-project/pull/79178

Reverting because `clang-repl -Xcc -mcpu=arm1176jzf-s` isn't overwriting this as I had expected. We need to check whether a specific CPU flag was given by the user first.

Reverts llvm/llvm-project#77491

>From c9a439ed53bc6852b913c202749b3aa8833b4207 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Gr=C3=A4nitz?= <stefan.graenitz at gmail.com>
Date: Tue, 23 Jan 2024 18:39:57 +0100
Subject: [PATCH] Revert "[clang-repl] Enable native CPU detection by default"

---
 clang/lib/Interpreter/Interpreter.cpp | 1 -
 1 file changed, 1 deletion(-)

diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index d1764d07dfd240..9f97a3c6b0be9e 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -148,7 +148,6 @@ IncrementalCompilerBuilder::create(std::vector<const char *> &ClangArgv) {
   // We do C++ by default; append right after argv[0] if no "-x" given
   ClangArgv.insert(ClangArgv.end(), "-Xclang");
   ClangArgv.insert(ClangArgv.end(), "-fincremental-extensions");
-  ClangArgv.insert(ClangArgv.end(), "-mcpu=native");
   ClangArgv.insert(ClangArgv.end(), "-c");
 
   // Put a dummy C++ file on to ensure there's at least one compile job for the