[clang] [Clang][CodeGen] Emit “trap reasons” on UBSan traps (PR #145967)

[Dan Liew via cfe-commits]

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@@ -85,6 +85,96 @@ enum VariableTypeDescriptorKind : uint16_t {
 //                        Miscellaneous Helper Methods
 //===--------------------------------------------------------------------===//
 
+static llvm::StringRef GetUBSanTrapForHandler(SanitizerHandler ID) {
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delcypher wrote:

Yes but with the caveat that  `SanitizerHandler::BoundsSafety` will need special handling because we don't want to emit a trap reason for that one because that's the value reserved for `-fbounds-safety` that handles it's trap reasons differently from the rest of UBSan.

https://github.com/llvm/llvm-project/pull/145967