Mega-patch: ripped SourceManager out of Diagnostic/DiagnosticClient.  Now
SourceManager is passed by reference, allowing the SourceManager to be
associated with a specific translation unit, and not the entire execution
of the driver.

Modified all users of Diagnostics to comply with this new interface.

Integrated SourceManager as a member variable of TargetInfo. TargetInfo will
eventually be associated with a single translation unit (just like
SourceManager).

Made the SourceManager reference in ASTContext private. Provided accessor
getSourceManager() for clients to use instead. Modified clients to comply with
new interface.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44878 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/TextDiagnostics.cpp b/Driver/TextDiagnostics.cpp
index 5b14cdd..46e535d 100644
--- a/Driver/TextDiagnostics.cpp
+++ b/Driver/TextDiagnostics.cpp
@@ -40,7 +40,8 @@
 }
 
 bool TextDiagnostics::IgnoreDiagnostic(Diagnostic::Level Level,
-                                       SourceLocation Pos) {
+                                       SourceLocation Pos,
+                                       SourceManager& SourceMgr) {
   if (Pos.isValid()) {
     // If this is a warning or note, and if it a system header, suppress the
     // diagnostic.