Inliner: Don't mark swifterror allocas with lifetime markers

This would create a bitcast use which fails the verifier: swifterror values may
only be used by loads, stores, and as function arguments.

rdar://28233244

llvm-svn: 281114

llvm/lib/Transforms/Utils/InlineFunction.cpp

@@ -1789,6 +1789,9 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
     IRBuilder<> builder(&FirstNewBlock->front());
     for (unsigned ai = 0, ae = IFI.StaticAllocas.size(); ai != ae; ++ai) {
       AllocaInst *AI = IFI.StaticAllocas[ai];
+      // Don't mark swifterror allocas. They can't have bitcast uses.
+      if (AI->isSwiftError())
+        continue;
 
       // If the alloca is already scoped to something smaller than the whole
       // function then there's no need to add redundant, less accurate markers.

llvm/test/Transforms/Inline/lifetime.ll

@@ -98,3 +98,20 @@ define void @test_arrays_alloca() {
 ; CHECK: ret void
   ret void
 }
+
+%swift.error = type opaque
+
+define void @helper_swifterror_alloca() {
+entry:
+  %swifterror = alloca swifterror %swift.error*, align 8
+  store %swift.error* null, %swift.error** %swifterror, align 8
+  ret void
+}
+
+define void @test_swifterror_alloca() {
+; CHECK-LABEL: @test_swifterror_alloca(
+; CHECK-NOT: lifetime
+  call void @helper_swifterror_alloca()
+; CHECK: ret void
+  ret void
+}