Don't recompute the presumed loc twice in 5 lines of code... Spotted by
inspection.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139196 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/TextDiagnosticPrinter.cpp b/lib/Frontend/TextDiagnosticPrinter.cpp
index 1da2494..976d3db 100644
--- a/lib/Frontend/TextDiagnosticPrinter.cpp
+++ b/lib/Frontend/TextDiagnosticPrinter.cpp
@@ -728,7 +728,7 @@
         break;
 
       OS << "fix-it:\"";
-      OS.write_escaped(SM.getPresumedLoc(BLoc).getFilename());
+      OS.write_escaped(PLoc.getFilename());
       OS << "\":{" << SM.getLineNumber(BInfo.first, BInfo.second)
         << ':' << SM.getColumnNumber(BInfo.first, BInfo.second)
         << '-' << SM.getLineNumber(EInfo.first, EInfo.second)