Revert "[Clang] Overflow Pattern Exclusions (#100272)"

This reverts commit 9a666deecb9ff6ca3a6b12e6c2877e19b74b54da.

Reason: broke buildbots

e.g., fork-ubsan.test started failing at
https://lab.llvm.org/buildbot/#/builders/66/builds/2819/steps/9/logs/stdio

  Clang :: CodeGen/compound-assign-overflow.c
  Clang :: CodeGen/sanitize-atomic-int-overflow.c
started failing with https://lab.llvm.org/buildbot/#/builders/52/builds/1570

1 files changed, 0 insertions, 13 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 5a5f5cb..e3911c2 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -4267,19 +4267,6 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
   }
 
-  if (auto *A = Args.getLastArg(OPT_fsanitize_overflow_pattern_exclusion_EQ)) {
-    for (int i = 0, n = A->getNumValues(); i != n; ++i) {
-      Opts.OverflowPatternExclusionMask |=
-          llvm::StringSwitch<unsigned>(A->getValue(i))
-              .Case("none", LangOptionsBase::None)
-              .Case("all", LangOptionsBase::All)
-              .Case("add-overflow-test", LangOptionsBase::AddOverflowTest)
-              .Case("negated-unsigned-const", LangOptionsBase::NegUnsignedConst)
-              .Case("post-decr-while", LangOptionsBase::PostDecrInWhile)
-              .Default(0);
-    }
-  }
-
   // Parse -fsanitize= arguments.
   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
                       Diags, Opts.Sanitize);