1) Allow '\' before a non-newline as a token in the preprocessor, and 2) localize line-continuation to just the pp scanner.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24530 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/ParseHelper.cpp

@@ -1484,6 +1484,7 @@ bool TParseContext::lineContinuationCheck(TSourceLoc loc, bool endOfComment)
 
     if (messages & EShMsgRelaxedErrors) {
         warn(loc, "not allowed in this version", message, "");
+        return true;
     } else {
         requireProfile(loc, EEsProfile | ECoreProfile | ECompatibilityProfile, message);
         profileRequires(loc, EEsProfile, 300, 0, message);