Fix erase! use in gcn.jl

[gbaraldi]

This was probably a typo when LLVM.jl moved to using erase! using find and replace

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diff --git a/src/gcn.jl b/src/gcn.jl
index 36165a2..1f32d46 100644
--- a/src/gcn.jl
+++ b/src/gcn.jl
@@ -87,7 +87,7 @@ function lower_throw_extra!(mod::LLVM.Module)
                     # remove the call
                     nargs = length(parameters(f))
                     call_args = arguments(call)
-                    erase!(call)
+                        erase!(call)
 
                     # HACK: kill the exceptions' unused arguments
                     for arg in call_args

[vchuravy]

Duplicate of #706