[FileCheck, test] Rename checkWildcardRegexCharMatchFailure

Proposed edit https://reviews.llvm.org/D97845#inline-922769 in D97845
suggests the checkWildcardRegexCharMatchFailure function name is
misleading because it is not clear it checks for a match failure on each
character in the string parameter. This commit renames it to an
hopefully clearer name.

Reviewed By: jdenny

Differential Revision: https://reviews.llvm.org/D98343
diff --git a/llvm/unittests/FileCheck/FileCheckTest.cpp b/llvm/unittests/FileCheck/FileCheckTest.cpp
index f54b940..59befc0 100644
--- a/llvm/unittests/FileCheck/FileCheckTest.cpp
+++ b/llvm/unittests/FileCheck/FileCheckTest.cpp
@@ -161,7 +161,7 @@
     return (Twine(Prefix) + Twine(Num)).str();
   }
 
-  void checkWildcardRegexCharMatchFailure(StringRef Chars) const {
+  void checkPerCharWildcardRegexMatchFailure(StringRef Chars) const {
     for (auto C : Chars) {
       std::string Str = addBasePrefix(StringRef(&C, 1));
       EXPECT_FALSE(WildcardRegex.match(Str));
@@ -259,9 +259,9 @@
   if (AllowHex) {
     LongNumberStr = addBasePrefix(AcceptedHexOnlyDigits);
     checkWildcardRegexMatch(LongNumberStr, 16);
-    checkWildcardRegexCharMatchFailure(RefusedHexOnlyDigits);
+    checkPerCharWildcardRegexMatchFailure(RefusedHexOnlyDigits);
   }
-  checkWildcardRegexCharMatchFailure(FirstInvalidCharDigits);
+  checkPerCharWildcardRegexMatchFailure(FirstInvalidCharDigits);
 
   // Check leading zeros are only accepted if number of digits is less than the
   // precision.