[llvm-commits] Handle constant folded bitcasts in eh lowering

[Duncan Sands]

The eh_selector, eh_filter and eh_typeid_for intrinsics take
arguments that should be a global variable or a bitcast of a
global variable.  A bitcast of a global variable can be constant
folded to a GEP in some cases, causing the current code to assert.
The attached patch fixes this.

Best wishes,

Duncan.
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