[hwasan] Implement -fsanitize-recover=hwaddress.

[eugenis]

Summary

Very similar to AddressSanitizer, with the exception of the error type encoding.

[kcc]

LGTM with a nit

compiler-rt/lib/hwasan/hwasan.cc

255 ↗

(On Diff #127613)

I'd prefer enums to booleans, for better readability

[eugenis]

compiler-rt/lib/hwasan/hwasan.cc

255 ↗

(On Diff #127613)

good idea!

[eugenis]

Replaced booleans with enums.
Added __builtin_unreachable in non-recover variants of callbacks.

[eugenis]

Tweaked a test.

lib/CodeGen/BackendUtil.cpp

PM.add(createAddressSanitizerFunctionPass(
       /*CompileKernel*/ true,
       /*Recover*/ true, /*UseAfterScope*/ false));
   PM.add(createAddressSanitizerModulePass(/*CompileKernel*/true,
                                           /*Recover*/true));
 }
 
 static void addHWAddressSanitizerPasses(const PassManagerBuilder &Builder,
                                             legacy::PassManagerBase &PM) {
-  PM.add(createHWAddressSanitizerPass());
+  const PassManagerBuilderWrapper &BuilderWrapper =
+      static_cast<const PassManagerBuilderWrapper &>(Builder);
+  const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
+  bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::HWAddress);
+  PM.add(createHWAddressSanitizerPass(Recover));
 }
 
 static void addMemorySanitizerPass(const PassManagerBuilder &Builder,
                                    legacy::PassManagerBase &PM) {
   const PassManagerBuilderWrapper &BuilderWrapper =
       static_cast<const PassManagerBuilderWrapper&>(Builder);
   const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
   int TrackOrigins = CGOpts.SanitizeMemoryTrackOrigins;