[clang] [Driver][BoundsSafety] Add -fbounds-safety-experimental flag (PR #70480)

[Dan Liew via cfe-commits]

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+
+// RUN: %clang -fbounds-safety-experimental -fsyntax-only %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fbounds-safety-experimental -fsyntax-only %s 2>&1 | FileCheck %s
+
+// CHECK: warning: '-fbounds-safety' is ignored for assembly
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delcypher wrote:

@rapidsna  Is some code missing from this PR? I see you now have a test but I can't find the code change that causes this warning to be emitted in the PR.

https://github.com/llvm/llvm-project/pull/70480