LDC Internal Compiler Error (ICE) mentioning attribute 'nocapture'

[Per Nordlöw]

Does anybody recognize the error

```
Attribute 'nocapture' does not apply to function return values
   %12 = call noalias nocapture align 8 ptr @_D3xxx(ptr nonnull 
%10, { i64, ptr } %11) #2, !dbg !7978
Attribute 'nocapture' does not apply to function return values
ptr @_D3xyz1
Attribute 'nocapture' does not apply to function return values
ptr @_D3xyz2
Attribute 'nocapture' does not apply to function return values
ptr @_D3xyz3
Attribute 'nocapture' does not apply to function return values
ptr @_D3xyz4
Attribute 'nocapture' does not apply to function return values
   %164 = call noalias nocapture align 8 ptr @_D3xyz5(ptr nonnull 
%rS72) #0, !dbg !9872
Attribute 'nocapture' does not apply to function return values
   %285 = call noalias nocapture align 8 ptr @_D3xyz6(ptr nonnull 
%284) #0, !dbg !9949
LLVM ERROR: Broken module found, compilation aborted!
#0 0x00005ee4d001e927 
llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) 
(~/.local/ldc2-1.37.0-beta1-linux-x86_64/bin/ldc2+0x6ad4927)
Error ldc2 failed with exit code -6.
```

? It's outputted when building and running a test application 
with ldc with the compiler flag `-fsanitize=address`.