[clang] [clang][driver] Allow unaligned access on ARMv7 and higher by default (PR #82400)

[David Green via cfe-commits]

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@@ -895,19 +895,17 @@ llvm::ARM::FPUKind arm::getARMTargetFeatures(const Driver &D,
     // defaults this bit to 0 and handles it as a system-wide (not
     // per-process) setting. It is therefore safe to assume that ARMv7+
     // Linux targets support unaligned accesses. The same goes for NaCl
-    // and Windows.
-    //
-    // The above behavior is consistent with GCC.
+    // and Windows. However, ARM's forks of GCC and Clang both allow
+    // unaligned accesses by default for all targets. We follow this
+    // behavior and enable unaligned accesses by default for ARMv7+ targets.
+    // Users can disable behavior via compiler options (-mno-unaliged-access).
+    // See https://github.com/llvm/llvm-project/issues/59560 for more info.
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davemgreen wrote:

Also, I would drop the reference to the github issue from the comment. People can inspect the git history if they need to go looking for a reason behind it. 

https://github.com/llvm/llvm-project/pull/82400