fix typo (#21473)

Author: innovimax

test/DebugInfo/DumpDeclFromMangledName.swift

@@ -16,12 +16,12 @@
 // RUN: not %lldb-moduleimport-test %t/DeclReconstr \
 // RUN:   --decl-from-mangled=patatino 2>&1 | \
 // RUN:   %FileCheck %s --check-prefix=INVALID-DECL
-// INVALID-DECL: patatino does not exists, exiting.
+// INVALID-DECL: patatino does not exist, exiting.
 
 // RUN: not %lldb-moduleimport-test %t/DeclReconstr \
 // RUN:   --type-from-mangled=patatino 2>&1 | \
 // RUN:   %FileCheck %s --check-prefix=INVALID-TYPE
-// INVALID-TYPE: patatino does not exists, exiting.
+// INVALID-TYPE: patatino does not exist, exiting.
 
 // RUN: %lldb-moduleimport-test %t/DeclReconstr \
 // RUN:   -decl-from-mangled=%t.input > %t.output 2>&1

tools/lldb-moduleimport-test/lldb-moduleimport-test.cpp

@@ -229,7 +229,7 @@ int main(int argc, char **argv) {
     if (Filename.empty())
       return true;
     if (!llvm::sys::fs::exists(llvm::Twine(Filename))) {
-      llvm::errs() << Filename << " does not exists, exiting.\n";
+      llvm::errs() << Filename << " does not exist, exiting.\n";
       return false;
     }
     if (!llvm::sys::fs::is_regular_file(llvm::Twine(Filename))) {

utils/build_swift/argparse/types.py

@@ -115,7 +115,7 @@ def __call__(self, path):
         path = os.path.abspath(path)
 
         if self._assert_exists and not os.path.exists(path):
-            raise ArgumentTypeError('{} does not exists'.format(path))
+            raise ArgumentTypeError('{} does not exist'.format(path))
 
         if self._assert_executable and not PathType._is_executable(path):
             raise ArgumentTypeError('{} is not an executable'.format(path))