[clang-cl] Bump default -fms-compatibility-version to 19.14

clang-cl MSVC required version is 19.20 now. Update the default
-fms-compatibility-version to 19.14.

Differential Revision: https://reviews.llvm.org/D114639

Author: omjavaid

clang/lib/Driver/ToolChains/MSVC.cpp

@@ -1393,8 +1393,8 @@ VersionTuple MSVCToolChain::computeMSVCVersion(const Driver *D,
   if (MSVT.empty() &&
       Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
                    IsWindowsMSVC)) {
-    // -fms-compatibility-version=19.14 is default, aka 2017, 15.7
-    MSVT = VersionTuple(19, 14);
+    // -fms-compatibility-version=19.20 is default, aka 2019, 16.x
+    MSVT = VersionTuple(19, 20);
   }
   return MSVT;
 }

clang/test/Driver/cl-options.c

@@ -757,7 +757,7 @@
 
 // Validate that the default triple is used when run an empty tools dir is specified
 // RUN: %clang_cl -vctoolsdir "" -### -- %s 2>&1 | FileCheck %s --check-prefix VCTOOLSDIR
-// VCTOOLSDIR: "-triple" "{{[a-zA-Z0-9_-]*}}-pc-windows-msvc19.14.0"
+// VCTOOLSDIR: "-triple" "{{[a-zA-Z0-9_-]*}}-pc-windows-msvc19.20.0"
 
 // Validate that built-in include paths are based on the supplied path
 // RUN: %clang_cl --target=aarch64-pc-windows-msvc -vctoolsdir "/fake" -winsdkdir "/foo" -winsdkversion 10.0.12345.0 -### -- %s 2>&1 | FileCheck %s --check-prefix FAKEDIR