Bump DIAG_SIZE_SEMA up to 4000

[sunfish]

Summary

https://reviews.llvm.org/D59520 adds a few new diagnostics, which happens to run into a limit with DIAG_SIZE_SEMA. As suggested here, here's a separate patch to bump the limit from 3500 to 4000.

[riccibruno]

Already done in r359702 :)

[sunfish]

Cool :)

include/clang/Basic/DiagnosticIDs.h

enum {
       DIAG_SIZE_DRIVER        =  200,
       DIAG_SIZE_FRONTEND      =  150,
       DIAG_SIZE_SERIALIZATION =  120,
       DIAG_SIZE_LEX           =  400,
       DIAG_SIZE_PARSE         =  500,
       DIAG_SIZE_AST           =  150,
       DIAG_SIZE_COMMENT       =  100,
       DIAG_SIZE_CROSSTU       =  100,
-      DIAG_SIZE_SEMA          = 3500,
+      DIAG_SIZE_SEMA          = 4000,
       DIAG_SIZE_ANALYSIS      =  100,
       DIAG_SIZE_REFACTORING   = 1000,
     };
     // Start position for diagnostics.
     enum {
       DIAG_START_COMMON        =                          0,
       DIAG_START_DRIVER        = DIAG_START_COMMON        + DIAG_SIZE_COMMON,
       DIAG_START_FRONTEND      = DIAG_START_DRIVER        + DIAG_SIZE_DRIVER,