Split catch IRgen into ItaniumCXXABI and MicrosoftCXXABI

Use llvm.eh.begincatch for Microsoft-style catches.

This moves lots of CGException code into ItaniumCXXABI. Sorry for the
blame pain.

llvm-svn: 231105
diff --git a/clang/test/CodeGenCXX/microsoft-abi-try-throw.cpp b/clang/test/CodeGenCXX/microsoft-abi-try-throw.cpp
index feb8292..5af1b0b 100644
--- a/clang/test/CodeGenCXX/microsoft-abi-try-throw.cpp
+++ b/clang/test/CodeGenCXX/microsoft-abi-try-throw.cpp
@@ -1,5 +1,4 @@
-// FIXME: Disabled until catch IRgen change lands.
-// RUNX: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fcxx-exceptions -fexceptions -fno-rtti -DTRY   | FileCheck %s -check-prefix=TRY
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fcxx-exceptions -fexceptions -fno-rtti -DTRY   | FileCheck %s -check-prefix=TRY
 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fcxx-exceptions -fexceptions -fno-rtti -DTHROW | FileCheck %s -check-prefix=THROW
 
 void external();
@@ -15,8 +14,8 @@
     external(); // TRY: invoke void @"\01?external@@YAXXZ"
   } catch (int) {
     rv = 1;
-    // TRY: call i8* @llvm.eh.begincatch
-    // TRY: call void @llvm.eh.endcatch
+    // TRY: call void @llvm.eh.begincatch(i8* %{{.*}}, i8* %{{.*}})
+    // TRY: call void @llvm.eh.endcatch()
   }
 #endif
 #ifdef THROW