[SystemZ] Support Swift calling convention

Summary:
Port rL265324 to SystemZ to allow using the 'swiftcall' attribute on that architecture.

Depends on D19414.

Reviewers: kbarton, rjmccall, uweigand

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D19432

llvm-svn: 267879

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 4e516513b34..b7fda8f5fa3 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -6548,6 +6548,16 @@ public:
         .Default(false);
   }
 
+  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
+    switch (CC) {
+    case CC_C:
+    case CC_Swift:
+      return CCCR_OK;
+    default:
+      return CCCR_Warning;
+    }
+  }
+
   StringRef getABI() const override {
     if (HasVector)
       return "vector";