Reapply "[LLVM][Instrumentation] Add numerical sanitizer (#85916)"

This reverts commit 493c384
and includes a fix for the build breakage.

llvm/include/llvm/Transforms/Instrumentation/NumericalStabilitySanitizer.h

@@ -0,0 +1,36 @@
+//===- NumericalStabilitySanitizer.h - NSan Pass ---------------*- C++ -*--===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// \file
+// This file defines the numerical stability sanitizer (nsan) pass.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_INSTRUMENTATION_NUMERICALSTABIITYSANITIZER_H
+#define LLVM_TRANSFORMS_INSTRUMENTATION_NUMERICALSTABIITYSANITIZER_H
+
+#include "llvm/IR/PassManager.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+/// A function pass for nsan instrumentation.
+///
+/// Instruments functions to duplicate floating point computations in a
+/// higher-precision type.
+/// This pass inserts calls to runtime library functions. If the
+/// functions aren't declared yet, the pass inserts the declarations.
+struct NumericalStabilitySanitizerPass
+    : public PassInfoMixin<NumericalStabilitySanitizerPass> {
+  PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
+  static bool isRequired() { return true; }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_INSTRUMENTATION_NUMERICALSTABIITYSANITIZER_H

llvm/lib/Passes/PassBuilder.cpp

@@ -184,6 +184,7 @@
 #include "llvm/Transforms/Instrumentation/LowerAllowCheckPass.h"
 #include "llvm/Transforms/Instrumentation/MemProfiler.h"
 #include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
+#include "llvm/Transforms/Instrumentation/NumericalStabilitySanitizer.h"
 #include "llvm/Transforms/Instrumentation/PGOCtxProfLowering.h"
 #include "llvm/Transforms/Instrumentation/PGOForceFunctionAttrs.h"
 #include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"

llvm/lib/Passes/PassRegistry.def

@@ -94,6 +94,7 @@ MODULE_PASS("metarenamer", MetaRenamerPass())
 MODULE_PASS("module-inline", ModuleInlinerPass())
 MODULE_PASS("name-anon-globals", NameAnonGlobalPass())
 MODULE_PASS("no-op-module", NoOpModulePass())
+MODULE_PASS("nsan", NumericalStabilitySanitizerPass())
 MODULE_PASS("objc-arc-apelim", ObjCARCAPElimPass())
 MODULE_PASS("openmp-opt", OpenMPOptPass())
 MODULE_PASS("openmp-opt-postlink",

llvm/lib/Transforms/Instrumentation/CMakeLists.txt

@@ -8,6 +8,7 @@ add_llvm_component_library(LLVMInstrumentation
   BlockCoverageInference.cpp
   MemProfiler.cpp
   MemorySanitizer.cpp
+  NumericalStabilitySanitizer.cpp
   IndirectCallPromotion.cpp
   Instrumentation.cpp
   InstrOrderFile.cpp