BaseTools:ECC report errors on account of analyze special characters

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1751

In case that a C function body contains the string of L'', L'\"',
L"\"", L''', L""", L"\"\"", L"\"^", L" \"", L"\" \"", ('L",\\\""')
ECC tool running under python3 interpreter will report error.
The antlr4 module misidentified this character

This patch is going to fix that issue.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/Ecc/CodeFragmentCollector.py

@@ -73,7 +73,7 @@ class CodeFragmentCollector:
         self.FileName = FileName
         self.CurrentLineNumber = 1
         self.CurrentOffsetWithinLine = 0
-
+        self.TokenReleaceList = []
         self.__Token = ""
         self.__SkippedChars = ""
 
@@ -503,6 +503,9 @@ class CodeFragmentCollector:
         FileStringContents = ''
         for fileLine in self.Profile.FileLinesList:
             FileStringContents += fileLine
+        for Token in self.TokenReleaceList:
+            if Token in FileStringContents:
+                FileStringContents = FileStringContents.replace(Token, 'TOKENSTRING')
         cStream = antlr.InputStream(FileStringContents)
         lexer = CLexer(cStream)
         tStream = antlr.CommonTokenStream(lexer)