[clang] [Clang][Driver] Add new flags to control IR verification (PR #68172)

[Matheus Izvekov via cfe-commits]

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@@ -5150,9 +5150,11 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   const bool IsAssertBuild = true;
 #endif
 
-  // Disable the verification pass in -asserts builds.
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mizvekov wrote:

I edited the line to append the `unless otherwise specified`, since now we allow overriding that with the new flag.

https://github.com/llvm/llvm-project/pull/68172